Finally find a way to escape whitespace in rst

to prevent creation of <blockquote> html when using leading spaces for
indentation.

doc/source/features.rst

@@ -141,3 +141,4 @@ Federation
    https://github.com/JOJ0/synadm/issues/new
 .. _pull request:
    https://github.com/JOJ0/synadm/blob/dev/CONTRIBUTING.md#submitting-your-work
+.. |nbindent| unicode:: U+00A0 U+00A0 .. non-breaking two-space indentation

doc/source/features_media.csv

@@ -1,6 +1,6 @@
 "`Querying media <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#querying-media>`_","---"
-"  `List all media in a room <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#list-all-media-in-a-room>`_",:option:`synadm media list -r`
-"  `List all media uploaded by a user <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#delete-media-uploaded-by-a-user>`_",:option:`synadm media list -u` :option:`synadm user media -f`
+"|nbindent| `List all media in a room <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#list-all-media-in-a-room>`_",:option:`synadm media list -r`
+"|nbindent| `List all media uploaded by a user <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#delete-media-uploaded-by-a-user>`_",:option:`synadm media list -u` :option:`synadm user media -f`
 "`Quarantine media <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#quarantine-media>`_","---"
 "  `Quarantining media by ID <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#quarantining-media-by-id>`_",:option:`synadm media quarantine -i`
 "  `Remove media from quarantine by ID <https://element-hq.github.io/synapse/latest/admin_api/media_admin_api.html#remove-media-from-quarantine-by-id>`_",:option:`synadm media unquarantine -i`