Tags fixes (#795)

* clarify where tags display

* note that groups can use tags

Author: ethanpalm

navigation.mdx

@@ -45,7 +45,7 @@ Pages is an array where each entry must be a reference to the path of a [page fi
 
 ## Groups
 
-Groups allow you to group your pages. Groups can also be nested within each other.
+Use groups to organize your navigation into sections. Groups can be nested within each other and labeled with tags.
 
 <img
   className="block dark:hidden pointer-events-none"

pages.mdx

@@ -60,7 +60,7 @@ iconType: "solid"
 
 ## Tag
 
-You can set a tag for your page. Tags display next to page titles in the sidebar. Use tags to categorize your pages and make them easier to find.
+Add tags to label specific pages. Tags display in the sidebar next to page titles.
 
 ```jsx
 ---