Updated mediawiki/extensions
Project: mediawiki/extensions/WebPlatformSearchAutocomplete  4217cbc32017e67dfc0f893206196dc5d989a8cd

Consistency tweaks in preparation for adding extension to translatewiki.net

* Add newline at end of file to unbreak twn's scripts
* Use template for extension description

Change-Id: I69845bd970418edef2363c90bf0a236bbc3e7e4e