Minor change to -h output for autoninja.

Notes that --offline is for disabling remote execution in general not just for goma.

Bug: b/329317224
Change-Id: I5538c9fac6d5161e98e1d156e61c512c6a1e8496
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5370094
Auto-Submit: Michael Savigny <msavigny@google.com>
Reviewed-by: Fumitoshi Ukai <ukai@google.com>
Commit-Queue: Fumitoshi Ukai <ukai@google.com>

autoninja.py

@@ -220,7 +220,7 @@ def main(args):
             offline = True
         elif arg == "-h":
             print(
-                "autoninja: Use -o/--offline to temporary disable goma.",
+                "autoninja: Use -o/--offline to temporary disable remote execution.",
                 file=sys.stderr,
             )
             print(file=sys.stderr)