Explain Hadoop configuration in Parquet.md

[clairemcginty]

No description provided.

[codecov]

Codecov Report

Merging #4703 (8accb91) into main (37ef0d5) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 8accb91 differs from pull request most recent head 16a840a. Consider uploading reports for the commit 16a840a to get more accurate results

@@            Coverage Diff             @@
##             main    #4703      +/-   ##
==========================================
- Coverage   60.93%   60.91%   -0.02%     
==========================================
  Files         286      286              
  Lines       10457    10457              
  Branches      667      667              
==========================================
- Hits         6372     6370       -2     
- Misses       4085     4087       +2     

Impacted Files	Coverage Δ
...y/scio/values/PairSkewedSCollectionFunctions.scala	93.24% <0.00%> (-2.71%)	⬇️

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