Fix media api link worded as in Synapse docs

Word our links exactly as the chapters/toc links in Synapse docs are!

doc/source/features.csv

@@ -2,7 +2,7 @@ Synapse API,synadm command group(s)
 `Acount Validity <https://element-hq.github.io/synapse/develop/admin_api/account_validity.html>`_,
 `Delete Group <https://element-hq.github.io/synapse/develop/admin_api/delete_group.html>`_,`synadm group <https://synadm.readthedocs.io/en/latest/synadm.cli.group.html>`_
 `Event Reports <https://element-hq.github.io/synapse/develop/admin_api/event_reports.html>`_,
-`Media Admin <https://element-hq.github.io/synapse/develop/admin_api/media_admin_api.html>`_,"`synadm media <https://synadm.readthedocs.io/en/latest/synadm.cli.media.html>`_
+`Media <https://element-hq.github.io/synapse/develop/admin_api/media_admin_api.html>`_,"`synadm media <https://synadm.readthedocs.io/en/latest/synadm.cli.media.html>`_
 `synadm user <https://synadm.readthedocs.io/en/latest/synadm.cli.user.html>`_"
 `Purge History <https://element-hq.github.io/synapse/develop/admin_api/purge_history_api.html>`_,`synadm history <https://synadm.readthedocs.io/en/latest/synadm.cli.history.html>`_
 `Purge Room <https://element-hq.github.io/synapse/develop/admin_api/purge_room.html>`_,`synadm room <https://synadm.readthedocs.io/en/latest/synadm.cli.room.html>`_