Added OpenAPI document link to usage

[NathanZook]

The OpenAPI document at /api/swagger.v1.json needs an obvious reference. Sadly, I am English monolingual, so someone else is going to have to do the other languages. In the mean time, this PR should help anyone looking for the file.

Signed-off-by: Nathan Zook [email protected]

[codecov-commenter]

Codecov Report

Merging #15535 (689c32a) into master (ce8255f) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #15535      +/-   ##
==========================================
- Coverage   43.84%   43.84%   -0.01%     
==========================================
  Files         678      678              
  Lines       81503    81503              
==========================================
- Hits        35736    35734       -2     
- Misses      39975    39976       +1     
- Partials     5792     5793       +1     

Impacted Files	Coverage Δ
modules/queue/workerpool.go	58.77% <0.00%> (-1.23%)	⬇️
models/repo_list.go	77.04% <0.00%> (-0.78%)	⬇️
services/pull/pull.go	43.02% <0.00%> (-0.46%)	⬇️
models/unit.go	49.31% <0.00%> (+2.73%)	⬆️
modules/util/timer.go	85.71% <0.00%> (+42.85%)	⬆️

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[techknowlogick]

Thanks for PR :)