doc: fix the number of points for 30 days
doc: fix the number of points for 30 days

Change-Id: I10a3852acefe8a35bb12559caa9528674786fa27
Closes-Bug: #1582057

gnocchixyz/gnocchi,gnocchixyz/gnocchi,sileht/gnocchi,leandroreox/gnocchi,leandroreox/gnocchi,sileht/gnocchi