Update RSACryptoServiceProvider.xml (#3439)

* Update RSACryptoServiceProvider.xml

- Remove irrelevant mention of SQL Server 2005 (nvarchar is supported in every modern version)
- Add missing details for LegalKeySizes

* minor formatting

Author: MSDN-WhiteKnight

xml/System.Security.Cryptography/RSACryptoServiceProvider.xml

@@ -469,7 +469,7 @@
 ## Examples  
  The following code example encrypts and decrypts data.  
   
- This example uses the <xref:System.Text.ASCIIEncoding> class; however, the <xref:System.Text.UnicodeEncoding> class may be preferable in large data operations. The encrypted value can be saved as an `nvarchar` data type in Microsoft SQL Server 2005.  
+ This example uses the <xref:System.Text.ASCIIEncoding> class; however, the <xref:System.Text.UnicodeEncoding> class may be preferable in large data operations. The encrypted value can be saved as an `nvarchar` data type in Microsoft SQL Server.
   
  [!code-cpp[Cryptography.RSACSP.Decrypt#1](~/samples/snippets/cpp/VS_Snippets_CLR/Cryptography.RSACSP.Decrypt/CPP/example.cpp#1)]
  [!code-csharp[Cryptography.RSACSP.Decrypt#1](~/samples/snippets/csharp/VS_Snippets_CLR/Cryptography.RSACSP.Decrypt/CS/example.cs#1)]
@@ -1296,9 +1296,17 @@
         <ReturnType>System.Security.Cryptography.KeySizes[]</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>Gets the key sizes that are supported by the asymmetric algorithm.</summary>
+        <value>An array that contains the key sizes supported by the asymmetric algorithm.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+  
+## Remarks
+
+The supported RSA key sizes depend on the available cryptographic service provider. For more information, see <xref:System.Security.Cryptography.RSACryptoServiceProvider#remarks> remarks.
+
+ ]]></format>
+    </remarks>
       </Docs>
     </Member>
     <Member MemberName="PersistKeyInCsp">