[lldb] Remove indentation before help output.

[JDevlieghere]

Summary

I always found it weird that there was this level of indentation before the first line of the help output. Supposedly it's meat to be aligned with the subcommands, but I find it visually confusion. This patch remove the indentation before the command help output.

Before

(lldb) help breakpoint
     Commands for operating on breakpoints (see 'help b' for shorthand.)

Syntax: breakpoint <subcommand> [<command-options>]

The following subcommands are supported:

      clear   -- Delete or disable breakpoints matching the specified source file and line.`

After

(lldb) help breakpoint
Commands for operating on breakpoints (see 'help b' for shorthand.)

Syntax: breakpoint <subcommand> [<command-options>]

The following subcommands are supported:

      clear   -- Delete or disable breakpoints matching the specified source file and line.

[JDevlieghere]

Explicit llvm::StringRef -> std::string conversion.

[teemperor]

LGTM

lldb/source/Interpreter/CommandObject.cpp

 void CommandObject::GenerateHelpText(CommandReturnObject &result) {
   GenerateHelpText(result.GetOutputStream());
 
   result.SetStatus(eReturnStatusSuccessFinishNoResult);
 }
 
 void CommandObject::GenerateHelpText(Stream &output_strm) {
   CommandInterpreter &interpreter = GetCommandInterpreter();
+  std::string help_text = GetHelp();
   if (WantsRawCommandString()) {
-    std::string help_text(GetHelp());
     help_text.append("  Expects 'raw' input (see 'help raw-input'.)");
-    interpreter.OutputFormattedHelpText(output_strm, "", "", help_text, 1);
-  } else
-    interpreter.OutputFormattedHelpText(output_strm, "", "", GetHelp(), 1);
+  }
+  interpreter.OutputFormattedHelpText(output_strm, "", help_text);
   output_strm << "\nSyntax: " << GetSyntax() << "\n";
   Options *options = GetOptions();
   if (options != nullptr) {
     options->GenerateOptionUsage(
         output_strm, this,
         GetCommandInterpreter().GetDebugger().GetTerminalWidth());
   }
   llvm::StringRef long_help = GetHelpLong();