Yes, this is something we are aware of.
Please use the direct link to the release version doc.

I think we are still waiting for the PyPI publication.



From: zzc <441586683@qq.com>
Sent: Tuesday, December 26, 2017 10:03:08 PM
To: dev@spark.apache.org
Subject: Re: [VOTE] Spark 2.2.1 (RC2)
 
Hi Felix Cheung:
  When to pulish the new version 2.2.1 of spark doc to the website, now it's
still the version 2.2.0.



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