Updated wiki documentation. Refs #8720.
Fix incorrect use of property declaration. Refs #8720.
Update property documentation. Refs #8720.
Correct documentation. Refs #8720.
Merge remote-tracking branch 'origin/master' into feature/8720_generatePyScript_documentation
Updated documentation. Refs #8720.

- Made clearer that generatePythonScript can output the content into a variable OR Python script file.
Merge remote-tracking branch 'origin/feature/8720_generatePyScript_documentation'