Rework final section to eliminate unwanted <p> tag inside <li>...

... and a lot more besides

_upgrading/sopel-8.md

@@ -474,13 +474,15 @@ Previously deprecated parts of Sopel's API have been removed, including:
 
 ### Deprecated API features
 
-More pieces of Sopel's pre-existing API have been deprecated in version 8.0 as
-we continue to reorganize and rework various parts of the overall project:
+More small legacy API features have been deprecated in version 8.0:
 
 * `bot.search_url_callbacks()` (use [`bot.rules.check_url_callbacks(bot,
-  url)`][check-url-callbacks])
-* `sopel.tools.OutputRedirect`
+  url)`][check-url-callbacks]; will be removed in 9.0)
+* `sopel.tools.OutputRedirect` (will be removed in 8.1)
 * `sopel.tools.stderr()` (we can't stress enough: plugins should use a logger,
-  not stdout/stderr output)
+  not stdout/stderr output; will be removed in 8.1)
+
+We continue to reorganize, modernize, and improve various parts of Sopel's API
+whenever possible. Thank you for your patience!
 
   [check-url-callbacks]: https://sopel.chat/docs/package/plugins/rules.html#sopel.plugins.rules.Manager.check_url_callback