docs(nav-set-root): fix typos (ionic-team#18946)

* docs(nav-set-root): fix typo a / of

* docs(nav-set-root): fix inconsistent terminology

Author: rtpHarry

core/src/components/nav-set-root/readme.md

@@ -1,7 +1,7 @@
 # ion-nav-set-root
 
-`NavSetRoot` is an element that allows you to set the root of the current navigation stack.
-It is the element form a calling `NavController.setRoot()`
+`NavSetRoot` is a component that allows you to set the root of the current navigation stack.
+It is the component form of calling `NavController.setRoot()`
 
 
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