docs(breaking): add breaking changes and copy editing (#17214)

- adds col auto to grid
- updates overlays to point to the same usage
- copy editing
- adds more info on the tabs changes
- documents event changes closes ionic-team/ionic-docs#258
- update nav event documentation

references #16819

core/src/components/nav/nav.tsx

@@ -85,7 +85,7 @@ export class Nav implements NavOutlet {
    */
   @Event() ionNavWillLoad!: EventEmitter<void>;
   /**
-   * Event fired when the nav will components
+   * Event fired when the nav will change components
    */
   @Event({ bubbles: false }) ionNavWillChange!: EventEmitter<void>;
   /**

core/src/components/nav/readme.md

@@ -23,7 +23,7 @@ Unlike RouterOutlet, Nav is not tied to a particular router. Meaning that if we
 | Event              | Description                                     | Type                |
 | ------------------ | ----------------------------------------------- | ------------------- |
 | `ionNavDidChange`  | Event fired when the nav has changed components | `CustomEvent<void>` |
-| `ionNavWillChange` | Event fired when the nav will components        | `CustomEvent<void>` |
+| `ionNavWillChange` | Event fired when the nav will change components | `CustomEvent<void>` |
 
 
 ## Methods