Update the docs for sqlite_unlock_notify

[typeless]

These cases are all I have found.

Some description of why sqlite_unlock_notify is needed might be helpful, but I am not capable of translating all the supported languages.

[codecov-io]

Codecov Report

Merging #5145 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5145      +/-   ##
==========================================
+ Coverage   37.47%   37.48%   +<.01%     
==========================================
  Files         309      309              
  Lines       45782    45782              
==========================================
+ Hits        17158    17161       +3     
+ Misses      26161    26158       -3     
  Partials     2463     2463

Impacted Files	Coverage Δ
models/repo_indexer.go	50.84% <0%> (ø)	⬆️
modules/process/manager.go	81.15% <0%> (+4.34%)	⬆️

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