Fixed examples

Fixed syntax errors in examples

Author: traviswindsormoodle

general/development/policies/codingstyle/index.md

@@ -1170,10 +1170,12 @@ All arguments to a function should be explicitly listed out and defined with a t
         context $context = null,
         array $options = [],
     ): string;
+```    
 </InvalidExample>
 
 If arguments are optional, then they should be marked appropriately as optional with a default value. 
 <ValidExample>
+```php
     function goodfunction(
         string $text,
         ?context $context = null,
@@ -1186,6 +1188,7 @@ If arguments are optional, then they should be marked appropriately as optional
         bool $blanktarget = false,
         bool $allowid = false,
     ): string;
+```
 </ValidExample>
 
 If there was a very good reason, then the use of an array could be considered. But it is strongly encouraged that all parameters be explict and typed.