[Messenger] Added a learn more section#10018

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Nyholm wants to merge 2 commits intosymfony:masterfrom

Nyholm:patch-messenger-learn-more

Commits on Jul 5, 2018

Added a learn more section
Nyholm
committed

Commits on Jul 6, 2018

Added a note about using the component in Symfony apps
javiereguiluz
authored