Merge pull request #24296 from ATREAY/storybook

added info about emit() function

docs/essentials/highlight.md

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+ℹ️  The `emit` function derived from the `useChannel` API hook creates a communication channel in Storybook's UI to listen for events and update the UI accordingly. The Highlight addon uses this channel to listen to custom events and update the highlighted elements (if any) accordingly.
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 ## Customize style
 
 By default, the addon applies a standard style to the highlighted elements you've enabled for the story. However, you can enable your custom style by extending the payload object and providing a `color` and/or `style` properties. For example:
@@ -70,4 +76,4 @@ By default, the addon applies a standard style to the highlighted elements you'v
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