quincy: doc/radosgw: refine "bucket notifications"

[zdover23]

This commit refines the English in the "Bucket Notifications REST API" section of the notifications.rst page (the "Bucket Notifications" page).

Co-author: Cole Mitchell cole.mitchell@gmail.com

Signed-off-by: Zac Dover zac.dover@gmail.com
(cherry picked from commit a69dd10)

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