Allow creation and modification of scopes in GN.

tools/gn/command_help.cc

Index: tools/gn/command_help.cc
diff --git a/tools/gn/command_help.cc b/tools/gn/command_help.cc
index 9bac894f9d6db1f62229e9d4008847be6acd6da2..68f0d0455dca94b2b848577cc0f281d936397ce9 100644
--- a/tools/gn/command_help.cc
+++ b/tools/gn/command_help.cc
@@ -62,7 +62,7 @@ void PrintToplevelHelp() {
   PrintShortHelp("all: Print all the help at once");
   PrintShortHelp("buildargs: How build arguments work.");
   PrintShortHelp("dotfile: Info about the toplevel .gn file.");
-  PrintShortHelp("grammar: Formal grammar for GN build files.");
+  PrintShortHelp("grammar: Language and grammar for GN build files.");
   PrintShortHelp(
       "input_conversion: Processing input from exec_script and read_file.");
   PrintShortHelp("label_pattern: Matching more than one label.");