Build the bluetooth doc snippet.

This ensures that it keeps compiling and is correct. Although
it wasn't able to compile due to a partial implementation, the snippet
itself had errors which demonstrated wrong API aspects.

Change-Id: I24048d968573e260d5b3ba92e38ce1dc9d24e52f
Reviewed-by: Nedim Hadzic <nhadzic@blackberry.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Update QtBluetooth docs for Qt 5.3

This fixes some spelling/grammar mistakes and updates information
that has changed in Qt 5.3

Change-Id: I09d1ea1dc3edef08c3ee6a494968e13e91385c29
Reviewed-by: Nedim Hadzic <nhadzic@blackberry.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>