Docs: daemon type misses “notify”

[Chris Halse Rogers]

https://github.com/snapcore/snapcraft/blob/master/docs/snapcraft-syntax.md lists the supported types of daemons as simple, oneshot, and forking. I happen to notice that the latest commit to snapcraft was “support the notify daemon type”, so this should probably be updated :)

[Leo Arias (elopio)]

Raising priority because we should never release anything that's not properly documented. Thanks for catching this Chris.

[Kyle Fazzari (kyrofa)]

Fix here: https://github.com/snapcore/snapcraft/pull/1041

[Mark Shuttleworth (sabdfl)]

Linking to snapd to get the web docs at https://snapcraft.io/docs/build-snaps/metadata properly fixed.

[Zygmunt Krynicki (zyga)]

The page https://snapcraft.io/docs/build-snaps/metadata now mentions "notify" and snapd does implement this at least as of 2.27.2 (perhaps before). I'm marking this as fix released.