Update general/development/policies/codingstyle/index.md

Co-authored-by: Copilot <[email protected]>

Author: traviswindsormoodle

general/development/policies/codingstyle/index.md

@@ -1168,7 +1168,7 @@ All arguments to a function should be explicitly listed out and defined with a t
 ```php
 public function badfunction(
     string $text,
-    context $context = null,
+    ?context $context = null,
     array $options = [],
 ): string;
 ```