Add description for array validation rule

[shalvah]

No description provided.

[codecov-io]

Codecov Report

Merging #348 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #348   +/-   ##
=========================================
  Coverage     87.55%   87.55%           
  Complexity      227      227           
=========================================
  Files             7        7           
  Lines           723      723           
=========================================
  Hits            633      633           
  Misses           90       90

Impacted Files	Coverage Δ	Complexity Δ
...rc/Mpociot/ApiDoc/Generators/AbstractGenerator.php	88.22% <100%> (ø)	136 <0> (ø)	⬇️

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