…5632)

* Given curl command doesn't work

The current curl command in writing-deploying-functions.md doesn't work. Firebase Callable functions expect a POST method and the body must contain a field called data.
(See: https://firebase.google.com/docs/functions/callable-reference)

* Update docs/functions/writing-deploying-functions.md

Co-authored-by: Mike Hardy <github@mikehardy.net>

… handler if message is data-only or undelivered" (#5641)

* Revert "lint fixes"

This reverts commit 6067c5f.

* Revert "fix: onMessage to only trigger for data-only or undelivered messages"

This reverts commit a31643b.