Mention automatic link matching in docs

Author: tcbegley

docs/components_page/components/nav.md

@@ -33,7 +33,7 @@ Use the `vertical` argument to stack navigation items. You can pass either a Boo
 
 ## Pills
 
-Use the `pills` argument to indicate active state with pill styled nav items.
+Use the `pills` argument to indicate active state with pill styled nav items. The `active` property can be set to `True` or `False` to manually control whether the link is active, or to `"exact"` to automatically set the `active` property when the current pathname matches the `href`, or to `"partial"` to automatically set the `active` property when the current pathname starts with `href`.
 
 {{example:components/nav/pill.py:nav}}