Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  887de04e4b43db8469dc66112575115a4f0c677e

Preserve some space around the close button so it doesn't look like butt

Addresses issue where heading is wide enough to almost touch close button

Change-Id: I25ab6ca0946d197a844140a11a1fee6cfcc28dee