fix(top-nav): minor edits to description, typos

Author: hunterloftis

packages/top-nav/README.md

@@ -1,6 +1,6 @@
 ## Description
 
-`<sp-top-nav>` deliveres site navigation particularly prepared for use when that navigation will change the majority of the pages content and/or the pages URL when activated. All primary elements of an `<sp-top-nav>` should be directly accessible in the tab order.
+`<sp-top-nav>` delivers site navigation, particularly for when that navigation will change the majority of the page's content and/or the page's URL when selected. All primary elements of an `<sp-top-nav>` should be directly accessible in the tab order.
 
 ### Installation