Fix relative link in docs (#2596)

[sjberman]

Problem: One of our relative links was incorrect and causing docs to fail to build.

Solution: Fix link.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.84%. Comparing base (76e882e) to head (e51431c).
Report is 1 commits behind head on release-1.4.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-1.4    #2598   +/-   ##
============================================
  Coverage        88.84%   88.84%           
============================================
  Files              100      100           
  Lines             7527     7527           
  Branches            50       50           
============================================
  Hits              6687     6687           
  Misses             784      784           
  Partials            56       56           

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