Updated capitalization in admin.rst

Updated capitalization of fabric and salt to Fabric and Salt
Hyphenation in ci.rst

Replaced frontend with front-end
Spelling and capitalization in scientific.rst

Changed python to Python and corrected some spelling
Capitalization in xml.rst

replaced:
 * xml to XML
 * python to Python
 * json to JSON
Capitalization in packaging.rst

Replaced python with Python
Capitalization in env.rst

Replaced python with Python
Update learning.rst

Changed choosen to chosen
Replaced python with Python
Replaced "python" with "Python"
Capitalization changes in web.rst

Replaced:
 * python with Python
 * javascript with JavaScript
Merge pull request #355 from smithandrewl/master

Capitalization / Spelling