David Turner 347b7594b7 Fix deprecation in history retention docs (#53655)
This commit adjusts a `deprecation[...]` message in the docs since such
messages must be on a single line. It also moves this message to the start of
the description of the deprecated setting as is the case with other such
messages.
2020-03-17 14:06:37 +00:00
..
2020-03-06 16:02:38 -07:00