Doc: Document signals (not handlers) under \qmlsignal

Append the handler names to the end of the corresponding signal doc.

Task-number: QTBUG-35846
Change-Id: I0d1c067e9eca4c3c28489a074a7f0e33759c000a
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Qt Bluetooth: Show correct names when compiling the module

Change-Id: I5f761cb428514d56fc88cd27def92defd3b83dd8
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>