Clarify that --global-options is used for bdist_wheel too

Author: sbidoul

src/pip/_internal/cli/cmdoptions.py

@@ -847,7 +847,7 @@ def _handle_no_use_pep517(option, opt, value, parser):
     action="append",
     metavar="options",
     help="Extra global options to be supplied to the setup.py "
-    "call before the install command.",
+    "call before the install or bdist_wheel command.",
 )  # type: Callable[..., Option]
 
 no_clean = partial(