Fix punctuation in documentation page

docs/digging-deeper/navigation.md

@@ -35,7 +35,7 @@ See the [Digging Deeper](#digging-deeper-into-the-internals) section of this pag
 
 All navigation menu items have an internal priority value that determines their order in the navigation.
 Lower values mean that the item will be higher up in the menu. The default for pages is `999` which puts them last.
-However, some pages are autoconfigured to have a lower priority, for example, the `index` page defaults to a priority of `0`,
+However, some pages are autoconfigured to have a lower priority, for example, the `index` page defaults to a priority of `0`.
 
 ### What to customize?