Remove a missed file and update the doc file
As part of my checks, after removing the IRegSelSvc.h interface, I put it back to get the code working and then forgot to remove it again. This should be the last part of the jigsaw.
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As part of my checks, after removing the IRegSelSvc.h interface, I put it back to get the code working and then forgot to remove it again. This should be the last part of the jigsaw.