Cosmetic tweaks to a hook script.
Cosmetic tweaks to a hook script.

* tools/hook-scripts/control-chars.py:
    Change top comment into a python doc string. Expand that doc string. Add
    comment. Replace loop with list-comprehension.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1461624 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion