Example included all 100 buckets, not 20% of buckets

Comment suggests that buckets 0 to 19 (20%) should be included in the
experiment, but the code goes on to include 0 to 100 (100%).

Additionally, comments had some typos
Comment Typos

Fixed some comment typos
Merge pull request #7 from martinpeck/master

Fixed bucket error in example along with some comment typos