Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  990a85a086013b3d68451f430e13e010f6883df7

Add documentation to WikibaseDataTypeBuilders

This is a direct follow-up to I53883a7921dea368ed8b38aa7513cbbd0f488964.

Change-Id: If263dfc532da02ceea7c72236477a4a2e4644a94