[Docs] Update Feature 'Reject unsigned commits'

[6543]

update docs
close #2770

because of #9708

[codecov-io]

Codecov Report

Merging #9793 into master will decrease coverage by 0.05%.
The diff coverage is 52.63%.

@@            Coverage Diff             @@
##           master    #9793      +/-   ##
==========================================
- Coverage   42.24%   42.19%   -0.06%     
==========================================
  Files         603      603              
  Lines       78837    78874      +37     
==========================================
- Hits        33303    33279      -24     
- Misses      41445    41516      +71     
+ Partials     4089     4079      -10

Impacted Files	Coverage Δ
routers/repo/http.go	38.75% <52.63%> (+1.08%)	⬆️
modules/util/sanitize.go	0% <0%> (-63.16%)	⬇️
modules/task/migrate.go	10.52% <0%> (-14.48%)	⬇️
models/task.go	15.45% <0%> (-13.64%)	⬇️
modules/migrations/migrate.go	21.57% <0%> (-4.22%)	⬇️
modules/repository/repo.go	26.28% <0%> (-1.55%)	⬇️
modules/migrations/gitea.go	6.89% <0%> (-1.46%)	⬇️
models/pull.go	41.98% <0%> (-0.61%)	⬇️
models/repo.go	46.86% <0%> (ø)	⬆️
services/pull/temp_repo.go	37.6% <0%> (+5.98%)	⬆️
... and 1 more

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