Documentation - fix up minor typos in getting started & demo site pages (#9443)

docs/getting_started/demo_site.md

@@ -1,5 +1,5 @@
 # Demo site
 
-To create a new site on Wagtail, we recommend the `wagtail start` command in [Getting started](index). We also have a demo site, The Wagtail Bakery, which contains example page types and models. We recommend you use the demo site for testing during development of Wagtail itself.
+To create a new site on Wagtail, we recommend the `wagtail start` command in [Getting started](index). We also have a demo site, The Wagtail Bakery, which contains example page types and models. We recommend you use the demo site for testing during the development of Wagtail itself.
 
-The source code and installation instructions can be found at <https://github.com/wagtail/bakerydemo>
+The source code and installation instructions can be found at <https://github.com/wagtail/bakerydemo>.

docs/getting_started/index.md

@@ -53,8 +53,8 @@ If you'd like to add Wagtail to an existing Django project instead, see [Integra
 
 There are a few optional packages which are not installed by default but are recommended to improve performance or add features to Wagtail, including:
 
--   [Elasticsearch](/advanced_topics/performance).
+-   [Elasticsearch](/advanced_topics/performance)
--   [Feature Detection](image_feature_detection).
+-   [Feature Detection](image_feature_detection)
 
 ```{toctree}
 ---