Added reference to the inherited option 'empty_data' on the collection form type page
Fixed (check -> checkMX) in PHP example
Realigned =>
Added information about the cssrewrite filter not working with the @AcmeFooBundle syntax. [kriswallsmith/assetic#53]

https://github.com/kriswallsmith/assetic/issues/53#issuecomment-2976018
[Assetic] Proofreading the Assetic section, rewriting parts, adding more details, evolving it
[#2263] Clarifying when assets are combined thanks to @stof
Merge pull request #2263 from symfony/assetic

Assetic
Correcting the link to the clearCookie method.
[#2267] Tweak thanks to @WouterJ
Merge branch '2.0' of github.com:hansallis/symfony-docs into hansallis-2.0

Conflicts:
	reference/forms/types/collection.rst
Merge branch '2.0' into 2.1