Update Email.rst

correct a typo in php code-block
Merge pull request #266 from tehem/patch-1

Update Email.rst
Merge remote-tracking branch 'upstream/master'
Merge branch 'StefTweet-2.3'
Merge branch 'cookbook/assetic' of git://github.com/tyx/symfony-docs-fr into tyx-cookbook/assetic
Merge branch 'tyx-cookbook/assetic' into 2.3