Release checklist: minor textual tweak after feedback

Author: jrfnl

.github/release-checklist.md

@@ -5,7 +5,7 @@
 ### General
 
 - [ ] Verify, and if necessary, update the version constraints for dependencies in the `composer.json` - PR #xxx
-- [ ] Verify that any new functions have (ClassName/array/callable) type declarations whenever possible.
+- [ ] Verify that any new functions have type declarations (ClassName/array/callable) whenever possible.
 - [ ] Verify that the license tags all refer to the _new_ organisation and no longer to Squizlabs. (easily overlooked in new files)
 - [ ] Verify that `@copyright` tags in new files use `@copyright 20xx PHPCSStandards and contributors`.