Add docs for REDIRECT_OTHER_PORT and PORT_TO_REDIRECT config options

[MCF]

For changes recently merged in: #1928

[codecov-io]

Codecov Report

Merging #3262 into master will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3262      +/-   ##
==========================================
+ Coverage   34.68%   34.87%   +0.18%     
==========================================
  Files         277      277              
  Lines       40177    40177              
==========================================
+ Hits        13937    14011      +74     
+ Misses      24190    24104      -86     
- Partials     2050     2062      +12

Impacted Files	Coverage Δ
modules/indexer/repo.go	60.86% <0%> (-6.96%)	⬇️
models/repo_indexer.go	50.97% <0%> (+0.48%)	⬆️
models/lfs.go	28.26% <0%> (+2.17%)	⬆️
modules/indexer/indexer.go	77.5% <0%> (+7.5%)	⬆️
modules/lfs/server.go	35.01% <0%> (+14.32%)	⬆️
modules/lfs/content_store.go	43.75% <0%> (+35.93%)	⬆️

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[lafriks]

LGTM

[ethantkoenig]

LGTM