Hi Michele,
Thanks for providing your feedback on this wording.

Almost all the text visible to your visitors and clients can be customised, to change this text you can create a language overrides file with this string:

$_LANG['clientAlerts']['servicesRenewingSoon'] = "You have :numberOfServices service(s) that are available for renewal soon.";

For more information, see: https://developers.whmcs.com/languages/overrides/