Update removal milestone for s3 storage driver

Tim Rizzirequested to merge
trizzi-master-patch-3928 into master

What does this MR do and why?

Based on #523095 (comment 2400441374):

The deprecation notes that it is deprecated as of 17.10 and will be removed in 18.0 This is incorrect. The removal won't happen until 19.0.

This MR updates the documentation and the deprecation notice.

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