Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/18485
  
    @tdas @marmbrus unfortunately the redirect page didn't generate. I suspect 
it's because the site may have been built without the `jekyll-redirect-from` 
plugin installed in `ruby`? just a guess. We had a similar problem with 
`ec2-scripts.md` and just removed it.
    
    As mentioned here https://github.com/apache/spark/pull/18611 this means 
unfortunately that http://spark.apache.org/docs/latest/programming-guide.html 
doesn't exist but it still referenced in the docs.
    
    I updated the main project site to just point to 
`rdd-programming-guide.html` instead, that's easy.
    
    It's also easy to update all of the rest of the links in the 
version-specific docs, and remove programming-guide.md and push a hotfix to the 
docs. The only downside there is that any other links to 
http://spark.apache.org/docs/latest/programming-guide.html out there in the 
world would 404.
    
    The alternative fix is to see if we can get the redirect working again.


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