DOC: list default compression for to_parquet

[jorisvandenbossche]

follow-up on GH19131

[codecov]

Codecov Report

Merging #19212 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #19212      +/-   ##
==========================================
+ Coverage   91.53%   91.55%   +0.02%     
==========================================
  Files         147      147              
  Lines       48797    48797              
==========================================
+ Hits        44664    44676      +12     
+ Misses       4133     4121      -12

Flag	Coverage Δ
#multiple	89.92% <ø> (+0.02%)	⬆️
#single	41.6% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/io/parquet.py	69.9% <ø> (ø)	⬆️
pandas/core/frame.py	97.62% <ø> (ø)	⬆️
pandas/plotting/_converter.py	66.95% <0%> (+1.73%)	⬆️

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