[lldb] Fix target stop-hook add help output

The help output for `target stop-hook add` references non-existing
option `--one-line-command`. The correct option is `--one-liner`:

```
-o <one-line-command> ( --one-liner <one-line-command> )
     Add a command for the stop hook.  Can be specified more than once,
     and commands will be run in the order they appear.
```

This commit fixes the help text.

rdar://152730660

Author: JDevlieghere

lldb/source/Commands/CommandObjectTarget.cpp

@@ -4885,9 +4885,9 @@ class CommandObjectTargetStopHookAdd : public CommandObjectParsed,
 Command Based stop-hooks:
 -------------------------
   Stop hooks can run a list of lldb commands by providing one or more
-  --one-line-command options.  The commands will get run in the order they are
-  added.  Or you can provide no commands, in which case you will enter a
-  command editor where you can enter the commands to be run.
+  --one-liner options.  The commands will get run in the order they are added.
+  Or you can provide no commands, in which case you will enter a command editor
+  where you can enter the commands to be run.
 
 Python Based Stop Hooks:
 ------------------------