[tor-bugs] #29884 [Core Tor/Tor]: Document how to edit practracker exception files

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#29884: Document how to edit practracker exception files
--------------------------+------------------------------------
 Reporter:  teor          |          Owner:  nickm
     Type:  defect        |         Status:  needs_review
 Priority:  High          |      Milestone:  Tor: 0.4.1.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  040-must      |  Actual Points:  .2
Parent ID:                |         Points:  0.2
 Reviewer:                |        Sponsor:
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Comment (by teor):

 These comments at the start of practracker.py are now outdated:
 {{{
 practracker.py should be run with its second argument pointing to the Tor
 top-level source directory like this:
   $ python3 ./scripts/maint/practracker/practracker.py .
 The exceptions file is meant to be initialized once with the current state
 of
 the source code and then get saved in the repository for ever after:
   $ python3 ./scripts/maint/practracker/practracker.py . >
 ./scripts/maint/practracker/exceptions.txt
 }}}

 Do we also need to update HelpfulTools.md?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29884#comment:4>
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