Update the selected audio session section

index.bs

@@ -55,7 +55,7 @@ Additionaly, an audio session [=audio session/element=] has associated steps for
 * <dfn data-lt="element suspend steps" for="audio session">Element suspend steps</dfn>, which are run when the audio session state moves from {{AudioSessionState/active}} to either {{AudioSessionState/interrupted}} or {{AudioSessionState/inactive}}.
 * <dfn data-lt="element resume steps" for="audio session">Element resume steps</dfn>, which are run when audio session state moves from {{AudioSessionState/interrupted}} to {{AudioSessionState/active}}.
 
-A [=top-level browsing context=] has a <dfn>selected audio session</dfn>. The [=selected audio session=] may be [=update the selected audio session|updated=] dynamically.
+A [=top-level browsing context=] has a <dfn>selected audio session</dfn>. In case of a change to any [=audio session=], the user agent will update which [=audio session=] becomes the [=selected audio session=].
 A [=top-level browsing context=] is said to have <dfn lt="audio focus" for="top-level browsing context">audio focus</dfn> if its [=selected audio session=] is not `null` and its state is {{AudioSessionState/active}}.
 
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