Update SecurityTransparentAttribute.xml (#3312)

* Update SecurityTransparentAttribute.xml Add note that partial trust code is no longer supported. * Update xml/System.Security/SecurityTransparentAttribute.xml * Update xml/System.Security/SecurityTransparentAttribute.xml Co-Authored-By: Ron Petrusha <ronpet@microsoft.com> * Add the note to all CAS attributes

Author: jkotas

xml/System.Security.Permissions/CodeAccessSecurityAttribute.xml

@@ -49,6 +49,9 @@
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 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  This attribute class associates a <xref:System.Security.Permissions.SecurityAction>, for example, `Demand`, with a custom security attribute. 
  
  The types that derive from <xref:System.Security.Permissions.CodeAccessSecurityAttribute> are used to help restrict access to resources or securable operations. 

xml/System.Security.Permissions/DataProtectionPermissionAttribute.xml

@@ -32,6 +32,9 @@
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 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> value that is used. 
  
  The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. <xref:System.Security.Permissions.DataProtectionPermissionAttribute> is used only for declarative security. For imperative security, use the <xref:System.Security.Permissions.DataProtectionPermission> class. 

xml/System.Security.Permissions/EnvironmentPermissionAttribute.xml

@@ -39,6 +39,9 @@
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 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> that is used. 
  
  The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class. 

xml/System.Security.Permissions/FileDialogPermissionAttribute.xml

@@ -39,6 +39,9 @@
  <format type="text/markdown"><![CDATA[ 
  
 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> that is used. 
  
  The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class. 

xml/System.Security.Permissions/FileIOPermissionAttribute.xml

@@ -39,6 +39,9 @@
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 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  Files and directories are specified using absolute paths. When accessing files, a security check is performed when the file is created or opened. The security check is not done again unless the file is closed and reopened. Checking permissions when the file is first accessed minimizes the impact of the security check on application performance because opening a file happens only once, while reading and writing can happen multiple times. 
  
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> that is used. 

xml/System.Security.Permissions/GacIdentityPermissionAttribute.xml

@@ -38,6 +38,9 @@
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 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  This class is used to ensure that callers are registered in the global assembly cache (GAC). 
  
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> value that is used. 

xml/System.Security.Permissions/HostProtectionAttribute.xml

@@ -38,6 +38,9 @@
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 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  This attribute affects only unmanaged applications that host the common language runtime and implement host protection, such as SQL Server. If the code is run in a client application or on a server that is not host-protected, the attribute "evaporates"; it is not detected and therefore not applied. When applied, the security action results in the creation of a link demand based on the host resources the class or method exposes. 
  
 > [!IMPORTANT]

xml/System.Security.Permissions/IsolatedStorageFilePermissionAttribute.xml

@@ -39,6 +39,9 @@
  <format type="text/markdown"><![CDATA[ 
  
 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> that is used. 
  
  The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class. 

xml/System.Security.Permissions/IsolatedStoragePermissionAttribute.xml

@@ -39,6 +39,9 @@
  <format type="text/markdown"><![CDATA[ 
  
 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  This class is an abstract base class. This class is never used instantiated; instead, classes that extend it and represent access to a particular type of isolated storage are used. 
  
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> that is used. 

xml/System.Security.Permissions/KeyContainerPermissionAttribute.xml

@@ -38,6 +38,9 @@
  <format type="text/markdown"><![CDATA[ 
  
 ## Remarks 
+> [!IMPORTANT]
+> Partially trusted code is no longer supported. This attribute has no effect in .NET Core.
+
  The scope of the declaration that is allowed depends on the <xref:System.Security.Permissions.SecurityAction> value that is used. 
  
  The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. <xref:System.Security.Permissions.KeyContainerPermissionAttribute> is used only for declarative security. For imperative security, use the <xref:System.Security.Permissions.KeyContainerPermission> class.