[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3665: Remove docutils pin from tox configuration

[Tahoe-LAFS]

#3665: Remove docutils pin from tox configuration
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 Reporter:  sajith              |          Owner:  sajith
     Type:  defect              |         Status:  new
 Priority:  normal              |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
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 In `tox.ini`, `[testenv:docs]` has pinned docutils 0.12 because of this
 old, no longer relevant bug:

 https://sourceforge.net/p/docutils/bugs/301/

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3665>
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