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Tailor Diffusion protocol rules slightly

Description

Tailor Diffusion protocol rules slightly

Summary: Fixes T10948. Ref T10923. Make these rules a little more thorough and document their behavior.

Test Plan: Looked at Diffusion clone URIs.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10923, T10948

Differential Revision: https://secure.phabricator.com/D15887