Fix gn get_label_info comment

tools/gn/function_get_label_info.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/label.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/value.h"
@@ skipping 53 matching lines @@
 
   "toolchain"
       The label of the toolchain. This will match the value of the
       "current_toolchain" variable when inside that target's declaration.
 
 Examples
 
   get_label_info(":foo", "name")
   # Returns string "foo".
 
-  get_label_info("//foo/bar:baz", "gen_dir")
+  get_label_info("//foo/bar:baz", "target_gen_dir")
   # Returns string "//out/Debug/gen/foo/bar".
 )*";
 
 Value RunGetLabelInfo(Scope* scope,
                       const FunctionCallNode* function,
                       const std::vector<Value>& args,
                       Err* err) {
   if (args.size() != 2) {
     *err = Err(function, "Expected two arguments.");
     return Value();
@@ skipping 50 matching lines @@
 
   } else {
     *err = Err(args[1], "Unknown value for \"what\" parameter.");
     return Value();
   }
 
   return result;
 }
 
 }  // namespace functions