[PATCH STABLE] graphlog: document what "_" and "*" mean

[Yuya Nishihara]

On Thu, 22 Feb 2018 15:34:03 +0800, Anton Shestakov wrote:
> # HG changeset patch
> # User Anton Shestakov <av6 at dwimlabs.net>
> # Date 1519283924 -28800
> #      Thu Feb 22 15:18:44 2018 +0800
> # Branch stable
> # Node ID a1b8de1983b1c5421f7c7195e01b20df5306500a
> # Parent  c19e66dacaa184feba31136c18a369ba995ddfe4
> graphlog: document what "_" and "*" mean

Queued for stable, thanks.