Update CONTRIBUTING.md

Co-authored-by: Noah Stapp <noah@noahstapp.com>

Author: sleepyStick

CONTRIBUTING.md

@@ -444,7 +444,7 @@ you are attempting to validate new spec tests in PyMongo.
 ### Automated Specification Test Resyncing
 There is a script (`/.evergreen/scripts/resync-all-specs.sh`) that will
 automatically run once a week to resync all the specs with the [specifications repo](https://github.com/mongodb/specifications).
-If there are changes, a PR will be generated by mongodb-drivers-pr-bot.
+A PR will be generated by mongodb-drivers-pr-bot containing any changes picked up by this resync.
 The PR description will display the name(s) of the updated specs along
 with any errors that occurred.