docs: add focus manager documentation (#3627)

Author: liamdebeasi

docs/api/title.md

@@ -57,7 +57,7 @@ When creating headings, we typically recommend using [semantic heading elements
 
 To achieve this, developers should use the [`heading` role](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/heading_role) on Title. This will indicate to assistive technologies that Title is a type of heading. From there, developers should use the [`aria-level` attribute](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-level) to set the heading level.
 
-For example, if we wanted to make a Title behave like an `h1` element, we would set `role="heading"` and `aria-level="1"` on the Title.
+For example, if we wanted to make a Title behave like an `h1` element, we would set `role="heading"` and `aria-level="1"` on the Title. This is necessary when using the [Focus Manager](../developing/managing-focus#assistive-technology-focus-management).
 
 Since multiple Title elements can be used on a view in conjunction with semantic heading elements, Ionic does not automatically set the Title's `role` or `aria-level`. It is the responsibility of the developer to handle this.