Fix double the typo

[ethantkoenig]

Noticed a typo in the command usages

[codecov]

Codecov Report

Merging #1185 into master will increase coverage by 1.86%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #1185      +/-   ##
=========================================
+ Coverage   67.44%   69.3%   +1.86%     
=========================================
  Files          28      21       -7     
  Lines        7778    7344     -434     
=========================================
- Hits         5246    5090     -156     
+ Misses       2046    1789     -257     
+ Partials      486     465      -21

Impacted Files	Coverage Δ
generator/structs.go	37.5% <0%> (-8.75%)	⬇️
generator/client.go	59.68% <0%> (-4.38%)	⬇️
generator/template_repo.go	59.49% <0%> (-3.38%)	⬇️
generator/shared.go	70.93% <0%> (-2.26%)	⬇️
generator/support.go	65.93% <0%> (-1.17%)	⬇️
scan/schema.go	69.38% <0%> (-0.73%)	⬇️
cmd/swagger/commands/generate/server.go
cmd/swagger/commands/generate/support.go
cmd/swagger/commands/generate/model.go
cmd/swagger/commands/generate/shared.go
... and 6 more

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