Docs: small updates to sitemaps page (#11585)

* Docs: small updates to sitemaps page

Closes #10816

* Update docs/user/reference/sitemaps.rst

---------

Co-authored-by: Eric Holscher <[email protected]>

Author: humitos

docs/user/reference/sitemaps.rst

@@ -1,5 +1,5 @@
-``sitemap.xml`` support
-=======================
+Sitemap support
+===============
 
 `Sitemaps <https://www.sitemaps.org/>`__ allow you to inform search engines about URLs that are available for crawling.
 This makes your content more :term:`discoverable <discoverability>`,
@@ -17,10 +17,8 @@ It contains information such as:
 * What translations are available for a page.
 
 Read the Docs automatically generates a ``sitemap.xml`` for your project,
-
-By default the sitemap includes:
-
-* Each version of your documentation and when it was last updated, sorted by version number.
+by default the sitemap includes each version of your documentation and when it was last updated,
+sorted by version number.
 
 This allows search engines to prioritize results based on the version number,
 sorted by `semantic versioning`_.