Update SuppressGCTransitionAttribute.xml (dotnet#9433)

* Update SuppressGCTransitionAttribute.xml Add note about exceptions being thrown at different times when this attribute is applied. --------- Co-authored-by: Genevieve Warren <24882762+gewarren@users.noreply.github.com>

Author: AaronRobinsonMSFT

xml/System.Runtime.InteropServices/SuppressGCTransitionAttribute.xml

@@ -51,6 +51,8 @@ This attribute is ignored if applied to a method without the <xref:System.Runtim
  * Immediate runtime termination.
  * Data corruption.
 
+Applying this attribute can cause the P/Invoke export to be bound earlier as a side-effect of the calling method being JIT compiled. <xref:System.EntryPointNotFoundException> or other exceptions might be thrown earlier than when the attribute is not applied.
+
  ]]></format>
  </remarks>
  </Docs>