Update messaging.mdx with info for sending a message from a script in…

[edtervit]

… the main world

Documentation update for this PR : https://github.com/PlasmoHQ/plasmo/pull/812

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 9, 2023 5:13pm