Update movie-recommendation.rst

Grammar correction
Update systemdesign.rst

Grammar correction
Update distributed.rst

Grammar correction
Merge pull request #6 from Capik/patch-1

Update movie-recommendation.rst
Merge pull request #7 from Capik/patch-2

Update systemdesign.rst
Merge pull request #8 from Capik/patch-3

Update distributed.rst
Bump to version 0.6.8
Merge branch 'develop'