Explain that props are updated on navigation (#6915)

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

src/content/docs/en/guides/view-transitions.mdx

@@ -112,10 +112,10 @@ For example, the following `<video>` will continue to play as you navigate to an
 
 You can also place the directive on an [Astro island](/en/concepts/islands/) (a UI framework component with a [`client:` directive](/en/reference/directives-reference/#client-directives)). If that component exists on the next page, the island from the old page **with its current state** will continue to be displayed, instead of replacing it with the island from the new page.
 
-In the example below, the `count` will not be reset when navigating back and forth across pages that contain the `<Counter />` component with the `transition:persist` attribute.
+In the example below, the component's internal state of the count will not be reset when navigating back and forth across pages that contain the `<Counter />` component with the `transition:persist` attribute.
 
 ```astro title="components/Header.astro" "transition:persist"
-<Counter client:load transition:persist count={5} />
+<Counter client:load transition:persist initialCount={5} />
 ```
 
 You can also [manually identify corresponding elements](#naming-a-transition) if the island/element is in a different component between the two pages.
@@ -134,6 +134,15 @@ As a convenient shorthand, `transition:persist` can alternatively take a transit
 <video controls="" autoplay="" transition:persist="media-player">
 ```
 
+#### `transition:persist-props`
+<p><Since v="4.5.0" /></p>
+
+This allows you to control whether or not an island's props should be persisted upon navigation.
+
+By default, when you add `transition:persist` to an island, the state is retained upon navigation, but your component will re-render with new props. This is useful, for example, when a component receives page-specific props such as the current page's `title`.
+
+You can override this behavior with `transition:persist-props`. Adding this directive will keep an island's existing props (not re-render with new values) in addition to maintaining its existing state.
+
 ### Built-in Animation Directives
 
 Astro comes with a few built-in animations to override the default `fade` transition. Add the `transition:animate` directive to individual elements to customize the behavior of specific transitions.