PHP API Ref: rm images dir (#3228)

Remove php_api_reference/images directory added in phpDocumentor v3.10.0 which we use since #3213

https://github.com/phpDocumentor/phpDocumentor/tree/v3.10.0/data/templates/default/images

Author: adriendupuis

tools/api_refs/api_refs.sh

@@ -191,7 +191,7 @@ fi;
 $PHP_BINARY $PHPDOC_BIN -t php_api_reference;
 if [ $? -eq 0 ]; then
   echo -n 'Remove unneeded from phpDocumentor output… ';
-  rm -rf ./php_api_reference/files ./php_api_reference/graphs ./php_api_reference/indices ./php_api_reference/packages;
+  rm -rf ./php_api_reference/files ./php_api_reference/graphs ./php_api_reference/images ./php_api_reference/indices ./php_api_reference/packages;
   rm -f ./php_api_reference/classes/Symfony-*.html ./php_api_reference/namespaces/symfony*.html
   echo -n 'Remove Symfony namespace from index… ';
   awk 'NR==FNR{if (/.*"fqsen": "\\\\Symfony.*/) for (i=-1;i<=3;i++) del[NR+i]; next} !(FNR in del)' \