[Messenger] [Messenger ] Add explanation on how to set default messenger table name

[r1n0x]

Added explanation on how to set default messenger table name

[OskarStark]

@r1n0x can you find out, since when this is possible? Do you have a PR or is it here since the beginning? IN this case we must target 5.4 branch, but we can handle that for you while merging.

Thanks

[r1n0x]

@OskarStark As far as I could find, it may be there from the beginnings of Doctrine transport - here's a link symfony/messenger@7234411
That would be messenger 4.3

[OskarStark]

Lets merge it in 5.4 then, thanks 👍

[javiereguiluz]

@r1n0x thanks and congrats on your first Symfony Docs contribution 🎉

[r1n0x]

Thanks!