Improved docs for range partitioning. (#12350)
Improved docs for range partitioning. (#12350)

* Improved docs for range partitioning.

1) Clarify the benefits of range partitioning.
2) Clarify which filters support pruning.
3) Include the fact that multi-value dimensions cannot be used for partitioning.

* Additional clarification.

* Update other section.

* Another adjustment.

* Updates from review.
monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid