[#1510] Correct License Not Specified capitalization
Update datastore.rst

Duplicitous 'the'
Merge pull request #1511 from adamamyl/patch-1

Typo-fix (duplication) in datastore.rst:
Merge pull request #1510 from ckan/1510-license-not-specified-capitalization

Correct License Not Specified capitalization
Fixing small typo in comment