Rename commands namespace from api to apidoc

[karkowg]

Resolves #346.

[codecov-io]

Codecov Report

Merging #352 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #352   +/-   ##
=========================================
  Coverage     87.53%   87.53%           
  Complexity      226      226           
=========================================
  Files             7        7           
  Lines           722      722           
=========================================
  Hits            632      632           
  Misses           90       90

Impacted Files	Coverage Δ	Complexity Δ
.../Mpociot/ApiDoc/Commands/GenerateDocumentation.php	90.41% <ø> (ø)	55 <0> (ø)	⬇️
...rc/Mpociot/ApiDoc/Commands/UpdateDocumentation.php	23.07% <ø> (ø)	3 <0> (ø)	⬇️

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[shalvah]

Hey, thank you for contributing. I've already merged #350 for this, unfortunately. There are a couple of other issues you can pick up (look for the 3.0 tag). Feel free to comment under an issue if you need any details or clarification.