docs: link directly to section on registering APIs

[waldyrious]

It's better to be explicit about where the information is located, than to vaguely suggest "reading on" :)

[codecov]

Codecov Report

Merging #191 (4ee9c7a) into main (d9c4f96) will not change coverage.
The diff coverage is n/a.

❗ Current head 4ee9c7a differs from pull request most recent head 569aced. Consider uploading reports for the commit 569aced to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage   74.95%   74.95%           
=======================================
  Files          25       25           
  Lines        3406     3406           
=======================================
  Hits         2553     2553           
  Misses        655      655           
  Partials      198      198           

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