startup: Update documentation

* Update links to mediawiki.org and jquery.com.
* Remove irrelevant link to jquerymobile.com.
* Fix documentation stating the isCompatible() function is
  deleted after use, because it isn't (and never was). The code
  pretending to delete it was removed in d0259d497d7e76d.

Change-Id: I4521521210778d9eea3959afcd62647410958305
Merge "startup: Update documentation"