Update index.rst

just a typo
Fix minor spelling mistakes.
Capitalise use of "English".
Merge pull request #27 from goodtune/typos

Fixes for a number of minor typographical errors.
Typo in writing/mindshare.rst: validations -> validates
Merge pull request #28 from eternicode/patch-1

Typo in writing/mindshare.rst: validations -> validates
Improve English in writing/documentation-usage.rst
Merge pull request #29 from eternicode/patch-2

Improve English in writing/documentation-usage.rst
Merge pull request #26 from mgaitan/patch-1

Update index.rst
Fixed a typo in sub-title
Merge pull request #30 from kirang89/master

Fixed a typo in sub-title
Fix wording