C#: Address review comments.

Author: michaelnebel

csharp/ql/integration-tests/posix/query-suite/csharp-code-quality.qls.expected

@@ -5,7 +5,6 @@ ql/csharp/ql/src/API Abuse/FormatInvalid.ql
 ql/csharp/ql/src/API Abuse/NoDisposeCallOnLocalIDisposable.ql
 ql/csharp/ql/src/API Abuse/NullArgumentToEquals.ql
 ql/csharp/ql/src/ASP/BlockCodeResponseWrite.ql
-ql/csharp/ql/src/Architecture/Refactoring Opportunities/InappropriateIntimacy.ql
 ql/csharp/ql/src/Bad Practices/CallsUnmanagedCode.ql
 ql/csharp/ql/src/Bad Practices/CatchOfNullReferenceException.ql
 ql/csharp/ql/src/Bad Practices/Control-Flow/ConstantCondition.ql

csharp/ql/src/Architecture/Refactoring Opportunities/InappropriateIntimacy.ql

@@ -6,8 +6,7 @@
  * @problem.severity recommendation
  * @precision high
  * @id cs/coupled-types
- * @tags quality
- *       maintainability
+ * @tags maintainability
  *       complexity
  *       modularity
  */