contrib/editmergeps.bat

graphlog: document what "_" and "*" mean

Documenting "*" should've been a part of 9b3f95d9783d, but I somehow didn't
notice that the symbols are explained in the command's help text.

@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"