Correct typo in FilterEvents description re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Use non-deprecated algorithm for GetMaskedDetectors re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Improve formating in description of PredictFractionalPeaks re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>