doc:增加附件ALLOWED_TYPES取得MIME type的方法

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增加附件ALLOWED_TYPES取得MIME type的方法

[codecov-io]

Codecov Report

Merging #8770 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8770      +/-   ##
==========================================
+ Coverage   41.39%   41.39%   +<.01%     
==========================================
  Files         539      539              
  Lines       69493    69493              
==========================================
+ Hits        28765    28766       +1     
+ Misses      37038    37034       -4     
- Partials     3690     3693       +3

Impacted Files	Coverage Δ
models/repo_indexer.go	68.36% <0%> (-1.82%)	⬇️
models/repo_list.go	73.3% <0%> (-0.98%)	⬇️
routers/repo/view.go	38.59% <0%> (+0.87%)	⬆️
modules/log/event.go	65.64% <0%> (+1.02%)	⬆️
models/unit.go	67.56% <0%> (+5.4%)	⬆️

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