Add missing SocketAddress API docs (dotnet#9306)

* Add missing SocketAddress API docs * Apply suggestions from code review Co-authored-by: Genevieve Warren <24882762+gewarren@users.noreply.github.com> Co-authored-by: Carlos Sánchez López <1175054+carlossanlop@users.noreply.github.com> --------- Co-authored-by: Genevieve Warren <24882762+gewarren@users.noreply.github.com> Co-authored-by: Carlos Sánchez López <1175054+carlossanlop@users.noreply.github.com>

Author: 3 people

xml/System.Net/SocketAddress.xml

@@ -217,9 +217,11 @@
  <ReturnType>System.Memory&lt;System.Byte&gt;</ReturnType>
  </ReturnValue>
  <Docs>
- <summary>To be added.</summary>
+ <summary>Gets the underlying memory that can be passed to native OS calls.</summary>
+
  <value>To be added.</value>
- <remarks>To be added.</remarks>
+ <remarks>The content of the buffer can be invalidated if <see cref="P:System.Net.SocketAddress.Size"/> is changed or if the <see cref="T:System.Net.SocketAddress"/> instance is used in another receive call.</remarks>
+
  </Docs>
  </Member>
  <Member MemberName="Equals">
@@ -446,9 +448,10 @@
  <Parameter Name="addressFamily" Type="System.Net.Sockets.AddressFamily" Index="0" FrameworkAlternate="net-8.0" />
  </Parameters>
  <Docs>
- <param name="addressFamily">To be added.</param>
- <summary>To be added.</summary>
- <returns>To be added.</returns>
+ <param name="addressFamily">The addressing scheme to use.</param>
+
+ <summary>Gets the maximum required buffer size for the given <see cref="T:System.Net.Sockets.AddressFamily"/>.</summary>
+ <returns>The maximum buffer size.</returns>
  <remarks>To be added.</remarks>
  </Docs>
  </Member>