remove stray comma [ci skip]

PROCESS.md

@@ -136,7 +136,7 @@ against the potential negative impact
 (things breaking without enough time to comfortably find and fix them before the release on the 22nd).
 When in doubt, we err on the side of _not_ cherry-picking.
 
-For example, it is likely that an exception will be made for a trivial 1-5 line performance improvement,
+For example, it is likely that an exception will be made for a trivial 1-5 line performance improvement
 (e.g. adding a database index or adding `includes` to a query), but not for a new feature, no matter how relatively small or thoroughly tested.
 
 Another exception example is a medium-risk feature such as a navigation change in response to significant negative community feedback from a previous release.