improve output scheme for admin query commands

Signed-off-by: Jason Volk <jason@zemos.net>

src/admin/query/users.rs

@@ -13,10 +13,9 @@ pub(super) async fn users(subcommand: Users) -> Result<RoomMessageEventContent>
 
 			let users = results.collect::<Vec<_>>();
 
-			Ok(RoomMessageEventContent::text_html(
-				format!("Query completed in {query_time:?}:\n\n```\n{users:?}```"),
-				format!("<p>Query completed in {query_time:?}:</p>\n<pre><code>{users:?}\n</code></pre>"),
-			))
+			Ok(RoomMessageEventContent::notice_markdown(format!(
+				"Query completed in {query_time:?}:\n\n```rs\n{users:#?}\n```"
+			)))
 		},
 	}
 }