docstore/all: Add a link to https://github.com/bartventer/docstore-gen.

[vangent]

Fixes #3387

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.15%. Comparing base (0059557) to head (9d9d854).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3390   +/-   ##
=======================================
  Coverage   73.15%   73.15%           
=======================================
  Files         113      113           
  Lines       14846    14846           
=======================================
  Hits        10860    10860           
  Misses       3213     3213           
  Partials      773      773           

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