fix: Resolved warning from xdebug extension initialized twice

Author: Wizofgoz

docker/xdebug.ini

@@ -1,4 +1,5 @@
-zend_extension=xdebug.so
+; zend_extension=xdebug is loaded by docker-php-ext-enable (see Dockerfile) —
+; declaring it again here would load it twice.
 
 ; Overridable at runtime via the XDEBUG_MODE env var, e.g. XDEBUG_MODE=off
 xdebug.mode=debug,develop