Delete blank line

Removed unnecessary line break and cleaned up formatting.

Author: jasnow

CONTRIBUTING.md

@@ -9,7 +9,6 @@
 * Please see the [README](README.md#schema) for more documentation on the
   YAML Schema.
 * Prior to submitting a pull request, run the tests:
-
 * Advisory filename and the root of the `url:` field must
   be equal `(as of 5/10/2026).`
 ```