fixed messengers.md

[LiveDuo]

Fixed typo in messengers.md describing message passing from L1 to L2.

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[maurelian]

Good catch thanks!

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

Hey @LiveDuo, this pull request failed to merge and has been dequeued from the merge train. If you believe your PR failed in the merge train because of a flaky test, requeue it by commenting with @mergifyio requeue.
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