Fix help and error messages.

tools/gn/function_set_defaults.cc

 // Copyright (c) 2013 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/functions.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scope.h"
 
 namespace functions {
@@ skipping 17 matching lines @@
     "  command.\n"
     "\n"
     "Example:\n"
     "  set_defaults(\"static_library\") {\n"
     "    configs = [ \"//tools/mything:settings\" ]\n"
     "  }\n"
     "\n"
     "  static_library(\"mylib\")\n"
     "    # The configs will be auto-populated as above. You can remove it if\n"
     "    # you don't want the default for a particular default:\n"
-    "    configs -= \"//tools/mything:setgings\"\n"
+    "    configs -= \"//tools/mything:settings\"\n"
     "  }\n";
 
 Value RunSetDefaults(Scope* scope,
                      const FunctionCallNode* function,
                      const std::vector<Value>& args,
                      BlockNode* block,
                      Err* err) {
   if (!EnsureSingleStringArg(function, args, err))
     return Value();
   const std::string& target_type(args[0].string_value());
@@ skipping 31 matching lines @@
     return Value();
 
   // Now copy the values set on the scope we made into the free-floating one
   // (with no containing scope) used to hold the target defaults.
   Scope* dest = scope->MakeTargetDefaults(target_type);
   block_scope.NonRecursiveMergeTo(dest, function, "<SHOULD NOT FAIL>", err);
   return Value();
 }
 
 }  // namespace functions