[phobos] [D-Programming-Language/installer] 63b9dc: Add explanation of change made to ReplaceInFile

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/installer
  Commit: 63b9dc50153f78db7f06bcd2f6a6eee21c7ed11e
      https://github.com/D-Programming-Language/installer/commit/63b9dc50153f78db7f06bcd2f6a6eee21c7ed11e
  Author: Brad Anderson <eco at gnuk.net>
  Date:   2016-01-18 (Mon, 18 Jan 2016)

  Changed paths:
    M windows/ReplaceInFile.nsh

  Log Message:
  -----------
  Add explanation of change made to ReplaceInFile

Also add a URL linking to the source of the script.