reef: doc/radosgw: Improve language and formatting in config-ref.rst

[zdover23]

The "Topic persistency settings" section includes convoluted and incomplete sentences so attempt to improve the language. The section lacks context so add a link to the relevant documentation about Notifications.

The "Garbage Collection settings" note includes a sentence that looks incomplete so try to improve the language.

Don't capitalize "Ops" in "RGW Ops" especially when the same sentence talks about "op queue" with lower case "o".

Also improve formatting: indentation of a note and wrap several very long lines.

Signed-off-by: Ville Ojamo 14869000+bluikko@users.noreply.github.com
(cherry picked from commit 9dd8677)

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