Document recommended way of connecting to [optional] APIs
Document recommended way of connecting to [optional] APIs

The correct way of connecting to an [optional] service isn't entirely
obvious, and isn't documented anywhere.  Add a recommended pattern
to the documentation of the [optional] keyword.

Resolves: LE-15978
Change-Id: I4ef069bfec6aced418f8e2cbc8d12d4db1ef72b0

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af