Out of date user id module support documentation

[patmmccann]

Type of issue

Description

Multiple pull requests for adapters supporting the user id module have not updated the documentation

Test page

http://prebid.org/dev-docs/modules/userId.html

Expected results

Index, sharethrough, pubmatic list which id's are supported

Actual results

Bidder	IDs Supported
beachfront	unifiedId/tradedesk
conversant	pubCommon
livewrapped	pubcommon
openx	pubcommon
rubicon	unifiedId/tradedesk
sonobi	pubCommon, unifiedId/tradedesk

Other information

#3744
#3819
#3834

[bretg]

Looking at PR #3744, IX doesn't actually support the UserID module.

The other two added to the docs site in prebid/prebid.github.io#1339 and are now showing on http://prebid.org/dev-docs/modules/userId.html#adapters-supporting-the-user-id-module