Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  6dd224623a07af1d0ffe93a6e415535b2d398782

Emit a proper doctype

So far we were not emitting a proper doctype in our output. Easy to fix, and
does not seem to affect any tests.

The VE should also handle this well enough as they are loading the document in
an iframe. Should double-check before deployment though.

Change-Id: I4d07dfe6f6207104e256b87078cc3a5404bbd7a6