Update 01-chapter3.markdown
Update 01-chapter1.markdown

The sentence did not make sense, so I hopefully could write it in a more clear format.
Merge pull request #781 from FrankLo/patch-1

Update 01-chapter1.markdown
Merge pull request #780 from wakeup/master

Update 01-chapter3.markdown
Merge branch 'progit/master' into ja