C#: Remove un-needed ql doc comment.

Author: michaelnebel

csharp/ql/lib/semmle/code/csharp/Generics.qll

@@ -278,7 +278,6 @@ class TypeParameterConstraints extends Element, @type_parameter_constraints {
   /** Gets a textual representation of these constraints. */
   override string toString() { result = "where " + this.getTypeParameter().getName() + ": ..." }
 
-  /** Gets a textual representation of the class */
   override string getAPrimaryQlClass() { result = "TypeParameterConstraints" }
 }