pacific: doc/rgw - fix grammar in table in s3.rst

[zdover23]

Put an "only" in the correct place. Also, this is a very small change that will allow me to see if Jenkins is working (it probably isn't).

Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit 1beab1e)

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[zdover23]

jenkins retest this please