minor #13738 [Docs] Synchronous messenger transport (Rafikooo)
minor #13738 [Docs] Synchronous messenger transport (Rafikooo)

This PR was merged into the 1.11 branch.

Discussion
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| Q               | A
| --------------- | -----
| Branch?         | 1.11 <!-- see the comment below -->
| Bug fix?        | no
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no <!-- don't forget to update the UPGRADE-*.md file -->
| License         | MIT

Synchronous messenger transport explained.
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 - Features and deprecations must be submitted against the master branch
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 To be sure you are not breaking any Backward Compatibilities, check the documentation:
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Commits
-------

bcd1ab592040c8b223e0678ea205fd47bebfcd0a [Docs] Synchronous messenger transport

diimpp/Sylius,Sylius/Sylius,Zales0123/Sylius,lchrusciel/Sylius,101medialab/Sylius,101medialab/Sylius,Sylius/Sylius,Zales0123/Sylius,Sylius/Sylius,lchrusciel/Sylius,SyliusBot/Sylius,SyliusBot/Sylius,loic425/Sylius,diimpp/Sylius,loic425/Sylius,diimpp/Sylius,SyliusBot/Sylius,loic425/Sylius,Zales0123/Sylius,101medialab/Sylius,lchrusciel/Sylius