Updated mediawiki/extensions
Project: mediawiki/extensions/VectorBeta  7a0929a8a07441b21cb989ca66aec3e15ffbd4d3

Typography tweaks

* Adjust heading styling
* Stop descender overlapping line on first heading
* Adjust table of contents border
* Adjust styling of related links (disambiguation links and rel links)

Change-Id: I6920f2f2da060248af66fcbb60f862660166aa86