make EnableOptimizedParameterBinding only apply to text mode commands and update documentation to match.

Author: Wraith2

doc/snippets/Microsoft.Data.SqlClient/SqlCommand.xml

@@ -1385,7 +1385,8 @@ The <xref:Microsoft.Data.SqlClient.SqlCommand.CreateParameter%2A> method is a st
 		</Dispose>
     <EnableOptimizedParameterBinding>
       <summary>
-        Gets or sets a value indicating whether the command object should optimize parameter performance by disabling Output and InputOutput directions when submitting the command to the SQL Server.
+        Gets or sets a value indicating whether the command object should optimize parameter performance by disabling Output and InputOutput directions when submitting the command to the SQL Server. <br />
+        This option is only used when the <see cref="P:Microsoft.Data.SqlClient.SqlCommand.CommandType" /> is <see cref="System.Data.CommandType.Text" >Text</see> otherwise it is ignored.
       </summary>
       <value>
         A value indicating whether the command object should optimize parameter performance by disabling Output and InputOuput parameter directions when submitting the command to the SQL Server. 

src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs

@@ -10103,7 +10103,7 @@ internal Task TdsExecuteRPC(SqlCommand cmd, IList<_SqlRPC> rpcArray, int timeout
                         int parametersLength = rpcext.userParamCount + rpcext.systemParamCount;
 
                         bool isAdvancedTraceOn = SqlClientEventSource.Log.IsAdvancedTraceOn();
-                        bool enableOptimizedParameterBinding = cmd.EnableOptimizedParameterBinding;
+                        bool enableOptimizedParameterBinding = cmd.EnableOptimizedParameterBinding && cmd.CommandType == CommandType.Text;
 
                         for (int i = (ii == startRpc) ? startParam : 0; i < parametersLength; i++)
                         {