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[docs] Update Phabricator docs about setting repository for diffs uploaded via…

Description

[docs] Update Phabricator docs about setting repository for diffs uploaded via web

Summary:
Docs are out of date now that we have separate repositories for LLVM,
Clang, etc.

Reviewers: asb

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D41919