[Docker] Update debug example to cover xkey usage

doc/docker/varnish.yml

@@ -30,11 +30,19 @@ services:
 
 ## DEBUG??
 # In need of debugging all request going to Varnish, use varnishlog, example:
-# docker-compose exec varnish varnishlog -c -i ReqURL,ReqMethod -I ReqHeader:X-Location-Id
-# Or more relevant only BAN's with all info:
-# docker-compose exec varnish varnishlog -g request -q "ReqMethod eq 'BAN'"
+#   docker-compose exec varnish varnishlog -c -i ReqURL,ReqMethod -I ReqHeader:xkey
+#  Or more relevant only PURGE's with all info:
+#   docker-compose exec varnish varnishlog -g request -q "ReqMethod eq 'PURGE'"
 #
-# But before doing that check that http and not local purge client is set:
-# docker-compose exec app app/console --env=dev debug:container ezpublish.http_cache.purge_client
+#  But before doing that check that http and not local purge client is set:
+#   docker-compose exec app app/console --env=dev debug:container ezplatform.http_cache.purge_client
+#
+# Or if you are using BAN requests and not using EzSystemsPlatformHttpCacheBundle:
+#   docker-compose exec varnish varnishlog -c -i ReqURL,ReqMethod -I ReqHeader:X-Location-Id
+#  Or more relevant only BAN's with all info:
+#   docker-compose exec varnish varnishlog -g request -q "ReqMethod eq 'BAN'"
+#
+#  But before doing that check that http and not local purge client is set:
+#   docker-compose exec app app/console --env=dev debug:container ezpublish.http_cache.purge_client
 #
 # And if in prod make sure you have rebuilt app container on code changes ;)