docs: remove hardcoded localhost link from API

[tivac]

Because the site probably shouldn't deploy links to localhost:3000.

[codecov-io]

Codecov Report

Merging #2352 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2352   +/-   ##
=======================================
  Coverage   91.83%   91.83%           
=======================================
  Files           1        1           
  Lines          49       49           
=======================================
  Hits           45       45           
  Misses          4        4

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e3c0887...a6f2dfb. Read the comment docs.