Fix bogus comments

Swift SVN r7401

Author: DougGregor

include/swift/AST/Decl.h

@@ -1299,7 +1299,7 @@ class GenericTypeParamDecl : public AbstractTypeParamDecl {
   /// }
   /// \endcode
   ///
-  /// Here 'T' has depth 0 and 'U' has depth 0. Both have index 0.
+  /// Here 'T' has depth 0 and 'U' has depth 1. Both have index 0.
   unsigned getDepth() const { return Depth; }
 
   /// Set the depth of this generic type parameter.

include/swift/AST/Types.h

@@ -1927,7 +1927,7 @@ class GenericTypeParamType : public AbstractTypeParamType {
   /// }
   /// \endcode
   ///
-  /// Here 'T' has depth 0 and 'U' has depth 0. Both have index 0.
+  /// Here 'T' has depth 0 and 'U' has depth 1. Both have index 0.
   unsigned getDepth() const;
 
   /// The index of this generic type parameter within its generic parameter