[Docs] Fix swagger description of reaction API

[6543]

sorry ... I made some misspells and whats worse: copy-paste-issues :/ on the swagger docu

[codecov-io]

Codecov Report

Merging #9617 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #9617      +/-   ##
==========================================
+ Coverage   42.18%   42.19%   +<.01%     
==========================================
  Files         578      578              
  Lines       76070    76070              
==========================================
+ Hits        32088    32094       +6     
+ Misses      39998    39996       -2     
+ Partials     3984     3980       -4

Impacted Files	Coverage Δ
routers/api/v1/repo/issue_reaction.go	75.27% <100%> (ø)	⬆️
modules/task/migrate.go	25% <0%> (-3.95%)	⬇️
models/error.go	32.71% <0%> (-1.11%)	⬇️
models/repo.go	47.97% <0%> (-0.11%)	⬇️
modules/migrations/gitea.go	9.66% <0%> (+0.63%)	⬆️
modules/log/event.go	65.64% <0%> (+1.02%)	⬆️
modules/migrations/migrate.go	25.78% <0%> (+1.57%)	⬆️
modules/repository/repo.go	35.52% <0%> (+1.97%)	⬆️
modules/log/file.go	77.62% <0%> (+2.09%)	⬆️
services/pull/temp_repo.go	34.18% <0%> (+2.56%)	⬆️

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