C++ PATCH: Fix typo in documentation

[Gabriel Dos Reis]

There is no TMPL_ARG_DEPTH; should be TMPL_ARGS_DEPTH.
Committed as obvious.

-- Gaby

2013-03-29  Gabriel Dos Reis  <g...@integrable-solutions.net>

        * pt.c (template_parms_to_args): Fix typo in comment.

Index: pt.c
===================================================================
--- pt.c        (revision 197258)
+++ pt.c        (working copy)
@@ -3874,10 +3874,10 @@
         Consider the level of the parms of TT; T and U both have
         level 2; TT has no template parm of level 1. So in this case
         the first element of full_template_args is NULL_TREE. If we
-        leave it like this TMPL_ARG_DEPTH on args returns 1 instead
+        leave it like this TMPL_ARGS_DEPTH on args returns 1 instead
         of 2. This will make tsubst wrongly consider that T and U
         have level 1. Instead, let's create a dummy vector as the
-        first element of full_template_args so that TMPL_ARG_DEPTH
+        first element of full_template_args so that TMPL_ARGS_DEPTH
         returns the correct depth for args.  */
       TREE_VEC_ELT (args, 0) = make_tree_vec (1);
   return args;