docs(nav): terminology tweaks (ionic-team#18970)

Author: rtpHarry

core/src/components/nav-push/readme.md

@@ -1,7 +1,8 @@
 # ion-nav-push
 
-`NavPush` is a component used to navigate to the specified component.
-It is the element form of `NavController.push()`
+Nav Push is a component used to navigate to the specified component.
+
+It is the component form of `NavController.push()`
 
 
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