Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  da2e4c78ac2f6889c3d039ae1d9932386a353d5f

Adhere to the CSS rule naming conventions

Update the post-edit and flyout CSS rules so that they adhere to the CSS
rule naming conventions.

Change-Id: Ia791e9bc66cd0d7a8f534dd2008b1ed0ebcff4ab