[LLDB] Fix help text for "platform settings"

[DavidSpickett]

Summary

This claims to take a platform name argument but doesn't.

That was probably the intent in fbb7634934d40548b650574a2f2a85ab41527674
but it has only ever worked with the current platform.

[DavidSpickett]

Alternatively, I could look at adding that option. Not sure off the top of my head if configuring an inactive platform would even work.

[DavidSpickett]

Ping!

[clayborg]

Sorry for the delay!

lldb/source/Commands/CommandObjectPlatform.cpp

protected:
   }
 };
 
 // "platform settings"
 class CommandObjectPlatformSettings : public CommandObjectParsed {
 public:
   CommandObjectPlatformSettings(CommandInterpreter &interpreter)
       : CommandObjectParsed(interpreter, "platform settings",
-                            "Set settings for the current target's platform, "
-                            "or for a platform by name.",
+                            "Set settings for the current target's platform.",
                             "platform settings", 0),
         m_option_working_dir(LLDB_OPT_SET_1, false, "working-dir", 'w',
                              CommandCompletions::eRemoteDiskDirectoryCompletion,
                              eArgTypePath,
                              "The working directory for the platform.") {
     m_options.Append(&m_option_working_dir, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
   }