Fix 'make help'

[silverwind]

These targets are actually using plural names, fix help output for them.

Ref: #12352

[codecov-commenter]

Codecov Report

Merging #12509 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12509      +/-   ##
==========================================
- Coverage   43.53%   43.53%   -0.01%     
==========================================
  Files         637      637              
  Lines       70825    70825              
==========================================
- Hits        30835    30831       -4     
- Misses      34989    34991       +2     
- Partials     5001     5003       +2     

Impacted Files	Coverage Δ
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/indexer/stats/db.go	43.47% <0.00%> (-17.40%)	⬇️
modules/indexer/stats/queue.go	64.70% <0.00%> (-11.77%)	⬇️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
modules/git/repo.go	49.23% <0.00%> (-0.51%)	⬇️
services/pull/pull.go	42.03% <0.00%> (+0.46%)	⬆️
modules/process/manager.go	75.00% <0.00%> (+2.50%)	⬆️
modules/log/event.go	59.43% <0.00%> (+2.83%)	⬆️

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