correct typos kindly spotted by Paul C.
Merge remote-tracking branch 'origin/master'
fixed 2 minor typos
Merge pull request #86 from ScienceScribe/master

fixed 2 minor typos
fixed typo in pvalue lesson
Merge remote-tracking branch 'origin/master'
typo in asymptotic lesson
Reworded a question.
Merge remote-tracking branch 'origin/master'
Update lesson.yaml

I found three "indicies" in line300, 305, 312, and have corrected them
Merge pull request #92 from Lewous/patch-1

Update lesson.yaml
Merge remote-tracking branch 'upstream/master'