Fix repetition in the description.

site/content/docs/4.6/components/navbar.md

 ---
 layout: docs
 title: Navbar
-description: Documentation and examples for Bootstrap's powerful, responsive navigation header, the navbar. Includes support for branding, navigation, and more, including support for our collapse plugin.
+description: Documentation and examples for Bootstrap's powerful, responsive navigation header, the navbar. Includes support for branding, navigation, collapse plugin, and more.
 group: components
 toc: true
 ---