Minor updates and typo fixes
Update information about Randomization setting
Minor update to text of "Randomization"
Revise randomization information per feedback from Victor
Further update randomization documentation
Minor updates and typo fixes
Update information about Randomization setting
Revise randomization information per feedback from Victor
Further update randomization documentation
Merge pull request #2325 from edx/sylvia/documentation/small_fixes

Sylvia/documentation/small fixes