[Docs] Add boolean data type to API syntax.
[Docs] Add boolean data type to API syntax.

The boolean data type was missing in the documentation.

Resolves: LE-12326
Change-Id: If5db39ab52c0e9c7e861b1af1b82be0b2e83757b

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