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help: document meaning of '%' in graphlog output

Authored by martinvonz.

Description

help: document meaning of '%' in graphlog output

I added the feature in 14d0e89520a2 (graphlog: use '%' for other
context in merge conflict, 2020-01-28), but I didn't think to look for
documentation until today (because an internal user asked about it).

Differential Revision: https://phab.mercurial-scm.org/D8649