doc: Revert doc/cephadm: correct markup in rgw.rst

doc: Revert doc/cephadm: correct markup in rgw.rst

This reverts commit fccb60922e80b0a446759ddfc8d1266b491277be.

Commit fccb609 backported changes that do not apply to Reef.
PR #63074 and the commit referenced therein as cherry-pick do not
correspond to the diff. Revert the commit because:

- Wildcard SAN feature in 3c24753 only since Tentacle.
- Disable multisite sync traffic feature in d620ba6 only since Squid.
- Shutdown delay feature in b84bb72 only since Tentacle.

Signed-off-by: Ville Ojamo <14869000+bluikko@users.noreply.github.com>