Update syntax for global code owner

Author: HonkingGoose

.github/CODEOWNERS

@@ -1,6 +1,7 @@
 # Users listed in the CODEOWNERS file must review (and approve) PRs before merge.
 
-@ben
+# Global code owners.
+* @ben
 
 # GitHub recommends listing the code owner in the CODEOWNER file.
 # This means changes to the CODEOWNERS file must be reviewed by the code owner.