[SPARK-21267][DOCS][MINOR] Follow up to avoid referencing programming-guide redirector #18625
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What changes were proposed in this pull request?
Update internal references from programming-guide to rdd-programming-guide
See apache/spark-website@5ddf243 and #18485 (comment)
Let's keep the redirector even if it's problematic to build, but not rely on it internally.
How was this patch tested?
(Doc build)