Remove needless Parquet notes

Co-authored-by: Adam Reeve <[email protected]>

_posts/2024-07-16-17.0.0-release.md

@@ -131,8 +131,6 @@ Thanks for your contributions and participation in the project!
 - Definition and repetition levels are now more strictly checked, avoiding later
   crashes when reading an invalid Parquet file (GH-41321).
 - A crash was fixed when reading an invalid encrypted Parquet file (GH-43070).
-- Fixed a bug where the BYTE_STREAM_SPLIT decoder could behave incorrectly
-  when nulls are present in a column (GH-41562).
 - Fixed a bug where `DeltaLengthByteArrayEncoder::EstimatedDataEncodedSize` could
   return an invalid estimate in some situations (GH-41545).
 - Delimiting records is now faster for columns with nested repeating (GH-41361).