Add some information to the API Token header

[zeripath]

This PR adds a description to the authorization token header in swagger.

Fix #7582

[codecov-io]

Codecov Report

Merging #7585 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7585      +/-   ##
==========================================
- Coverage   41.24%   41.24%   -0.01%     
==========================================
  Files         469      469              
  Lines       63608    63608              
==========================================
- Hits        26238    26232       -6     
- Misses      33950    33957       +7     
+ Partials     3420     3419       -1

Impacted Files	Coverage Δ
routers/api/v1/api.go	71.36% <ø> (ø)	⬆️
models/unit.go	62.16% <0%> (-5.41%)	⬇️
routers/repo/view.go	42.23% <0%> (-1.02%)	⬇️

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