Add missing notes to RELEASE-NOTES for Wear release

[irfano]

I forgot to add the release notes for Wear in the 21.6 release. This PR includes the missing note.

[dangermattic]

	1 Message
📖	This PR has the Releases label: some checks will be skipped.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	7b0c815
	Direct Download	woocommerce-wear-prototype-build-pr13456-7b0c815.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	7b0c815
	Direct Download	woocommerce-prototype-build-pr13456-7b0c815.apk

[AliSoftware]

@irfano FYI I ran bundle exec fastlane update_play_store_strings in 7b0c815 to update the PlayStoreStrings.pot file so that it includes the updated Wear release notes.

That way once you will trigger a new beta after this PR is merged in release/21.6, the backmerge PR that will get subsequently created will make that .pot be propagated all the way to trunk and that .pot file should be picked up to be sent for translation.