Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  770dbaef8f181ecf2ba72d213063a6ece9c59abe

Don't underline the 'user guide' link when hovering the tool menu

There are wider issues about sub-tools here, but this fixes the most glaring issue
for now.

Change-Id: I5ff2d67642daea2f84ccc56fe391eee9ca01d099