Bluetooth: host: Allow attribute as NULL with notify / indicate by UUID

Allow to pass attribute as NULL pointer when using notify or indicate by
UUID. This will use the entire handle value range to search for an
attribute with a matching UUID.
Document optional parameters, and clarify attr and uuid usage in the
variable declaration in the struct for clarification.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>
2 files changed