Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  2780ad256e610038794c31d92536492f7f45818f

Add documentation to DOMUtils.

Co-authored-by: C. Scott Ananian <cscott@cscott.net>
Change-Id: I6168da8944650abb9787d284b87e3ec521f2f88d