[lldb] Document <run-args> behavior in process launch help

Update the help for `process launch` to say that with no arguments, it
will reuse the run-args from target.run-args.

rdar://139768013

Author: JDevlieghere

lldb/source/Commands/CommandObjectProcess.cpp

@@ -118,8 +118,9 @@ class CommandObjectProcessLaunch : public CommandObjectProcessLaunchOrAttach {
   CommandObjectProcessLaunch(CommandInterpreter &interpreter)
       : CommandObjectProcessLaunchOrAttach(
             interpreter, "process launch",
-            "Launch the executable in the debugger.", nullptr,
-            eCommandRequiresTarget, "restart"),
+            "Launch the executable in the debugger. If no run-args are "
+            "specified, the arguments from target.run-args are used.",
+            nullptr, eCommandRequiresTarget, "restart"),
 
         m_class_options("scripted process", true, 'C', 'k', 'v', 0) {
     m_all_options.Append(&m_options);