contrib/editmergeps.bat

rewriteutil: point to help about instability when rewriting creates orphan

This replicates the message from the evolve extension.

Differential Revision: https://phab.mercurial-scm.org/D10517

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