Fix documentation for IPvAny* schema mappings

[sam-bristow]

Change Summary

Update documentation for IPvAnyAddress, IPvAnyInterface and IPvAnyNetwork There was a minor typo - these types support both IPv4 and IPv6.

Related issue number

#333 (minor documentation fix-up)

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable
• HISTORY.rst has been updated
  • if this is the first change since a release, please add a new section
  • include the issue number or this pull request number #<number>
  • include your github username @<whomever>

[codecov]

Codecov Report

Merging #433 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #433   +/-   ##
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  Coverage     100%   100%           
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  Files          14     14           
  Lines        2156   2156           
  Branches      426    426           
=====================================
  Hits         2156   2156

[samuelcolvin]

Thanks a lot, docs will be updated with the next release.