Update xdebug.md

Author: Kanti

docs/xdebug.md

@@ -52,12 +52,14 @@ XDEBUG_CONFIG="client_enable=1" ...
 
 you can enable the xdebug log like this:
 
-`touch xdebug.log`
+````
+touch xdebug.log
+````
 
 add this to your docker-compose.yml
 ````
       - php.xdebug.log=/app/xdebug.log
 ````
 
 [xdebug-setup]: ./images/xdebug-phpstorm-server-config.png
-[xdebug-listen]: ./images/xdebug-listen.png
+[xdebug-listen]: ./images/xdebug-listen.png