fix: C API link in book (#371)

[wackbyte]

No description provided.

[Wodann]

Thanks for fixing this 😃

[codecov]

Codecov Report

Merging #372 (f9431d3) into main (b74092a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #372   +/-   ##
=======================================
  Coverage   82.54%   82.54%           
=======================================
  Files         264      264           
  Lines       15247    15247           
=======================================
  Hits        12586    12586           
  Misses       2661     2661           

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[wackbyte]

👍

[baszalmstra]

Thanks!