Merge pull request #2250 from dlemstra/SA1310

Fixed pragma example.

Author: sharwell

documentation/SA1310.md

@@ -36,6 +36,6 @@ To fix a violation of this rule, remove the underscore from the name of the fiel
 ```
 
 ```csharp
-#pragma warning disable  // 
-#pragma warning restore  // 
+#pragma warning disable SA1310 // FieldNamesMustNotContainUnderscore
+#pragma warning restore SA1310 // FieldNamesMustNotContainUnderscore
 ```