we should keep track ofsymfony/symfony#8352 and change it on the master branch

Hey Wouter!

So, this is a really nice entry. BUT, the original issue was not a good one. This feature is actually already documented, here:http://symfony.com/doc/current/book/internals.html#configuration

Now, I think it's better to have this as a standalone cookbook entry, but since the documentation exists, we need to tweak few things with this PR:

1. Remove the stuff in the internals doc and replace with a link to this new cookbook entry
2. Make sure that a few of the things that are documented in the internals version (e.g. matching by path - that may actually be the only missing thing) is documented in the new version.

@wouterj - can you make these changes?

Thanks!

"the original issue was not a good one"
Do you mean it was talking about something else or that it was already fixed?

And do you really think it's needed to add a path example? I'll add some information in the paragraph about the path option and fix (1) this afternoon.

Merged! Minor tweaks at sha:826197b. This reads very well and I like the example you chose.

Thanks Wouter!