Update NDArray.java

[ElchananHaas]

Fix documentation of minimum of two NDArrays to read minimum, not maximum.

#1112

[frankfliu]

Thanks for your contribution.

[codecov-commenter]

Codecov Report

Merging #1113 (d9904e2) into master (ad6b11f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1113   +/-   ##
=========================================
  Coverage     70.01%   70.01%           
  Complexity     5276     5276           
=========================================
  Files           514      514           
  Lines         23489    23489           
  Branches       2516     2516           
=========================================
  Hits          16446    16446           
  Misses         5705     5705           
  Partials       1338     1338           

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/ndarray/NDArray.java	73.25% <ø> (ø)

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