[css-view-transitions-1] Add a note about why view-transition-name is animatable (w3c#9630)

As per resolution
Closes w3c#9616

Author: noamr

css-view-transitions-1/Overview.bs

@@ -519,6 +519,11 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 	Animation type: discrete
 	</pre>
 
+	Note: though 'view-transition-name' is [=discrete|discretely animatable=], animating it doesn't
+	affect the running view transition. Rather, it's a way to set its value in a way that can change
+	over time or based on a [=timeline=]. An example for using this would be to change the 'view-transition-name'
+	based on [=scroll-driven animations=].
+
 	The 'view-transition-name' property “tags” an element
 	for [=capture in a view transition=],
 	tracking it independently in the [=view transition tree=]
@@ -1934,6 +1939,7 @@ Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230
 * Animate back-drop filter similar to transform/size. See <a href="https://github.com/w3c/csswg-drafts/issues/9358">issue 9358</a>.
 * Copy `color-scheme` from DOM element to ''::view-transition-group()''. See <a href="https://github.com/w3c/csswg-drafts/issues/9276">issue 9276</a>.
 * Expose [=auto-skip view transition=] for a {{Document}}, to allow having outbound cross-document transitions preceed programmatic view transiitons. see <a href="https://github.com/w3c/csswg-drafts/issues/9512">issue 9512</a>.
+* Add a note about why 'view-transition-name' should be animatable.
 
 <h3 id="changes-since-2022-05-25">
 Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230525/">2022-05-25 Working Draft</a>