GN: Trim newlines in markdown help blocks

tools/gn/command_help.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 <algorithm>
 #include <iostream>
 
 #include "base/command_line.h"
 #include "tools/gn/args.h"
 #include "tools/gn/commands.h"
@@ skipping 69 matching lines @@
   const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
   bool is_markdown = cmdline->HasSwitch(switches::kMarkdown);
 
   OutputString("Available global switches\n", DECORATION_YELLOW);
   OutputString(
       "  Do \"gn help --the_switch_you_want_help_on\" for more. Individual\n"
       "  commands may take command-specific switches not listed here. See the\n"
       "  help on your specific command for more.\n\n");
 
   if (is_markdown)
-    OutputString("```\n\n", DECORATION_NONE);
+    OutputString("```\n", DECORATION_NONE);
 
   for (const auto& s : switches::GetSwitches())
     PrintShortHelp(s.second.short_help);
 
   if (is_markdown)
-    OutputString("\n```\n", DECORATION_NONE);
+    OutputString("```\n", DECORATION_NONE);
 
   OutputString("\n");
 }
 
 void PrintAllHelp() {
   const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
   bool is_markdown = cmdline->HasSwitch(switches::kMarkdown);
 
   if (is_markdown) {
     OutputString("# GN Reference\n\n");
@@ skipping 201 matching lines @@
     OutputString("Run `gn help` for a list of available topics.\n",
                  DECORATION_NONE);
   } else {
     OutputString("Did you mean `gn help " + suggestion.as_string() + "`?\n",
                  DECORATION_NONE);
   }
   return 1;
 }
 
 }  // namespace commands