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Fix some links to "Adding New Classes" in docs

Description

Fix some links to "Adding New Classes" in docs

Summary: Fixes T9483. This bookname is phabcontrib, not contributor.

Test Plan: grep / clicked these links.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9483

Differential Revision: https://secure.phabricator.com/D14195