Reference configs variable from config help in GN

tools/gn/functions.cc

Index: tools/gn/functions.cc
diff --git a/tools/gn/functions.cc b/tools/gn/functions.cc
index 18fd0b392e8eaac231045a8ba24bc56985136088..5101a41d276009e24a40c4040e6dd7c4a7167c13 100644
--- a/tools/gn/functions.cc
+++ b/tools/gn/functions.cc
@@ -261,13 +261,17 @@ const char kConfig_Help[] =
     "   4. All dependent configs from a breadth-first traversal of the\n"
     "      dependency tree in the order that the targets appear in \"deps\".\n"
     "\n"
-    "Variables valid in a config definition:\n"
+    "Variables valid in a config definition\n"
+    "\n"
     CONFIG_VALUES_VARS_HELP
+    "  Nested configs: configs\n"
+    "\n"
+    "Variables on a target used to apply configs\n"
     "\n"
-    "Variables on a target used to apply configs:\n"
     "  all_dependent_configs, configs, public_configs\n"
     "\n"
-    "Example:\n"
+    "Example\n"
+    "\n"
     "  config(\"myconfig\") {\n"
     "    includes = [ \"include/common\" ]\n"
     "    defines = [ \"ENABLE_DOOM_MELON\" ]\n"