Problems with AutoCorrect configuration parameter

[jonas054]

A generic AutoCorrect configuration parameter that can be used in for any cop was introduced in #1657. It has two shortcomings:

1. It needs to be configured like this

CopName:
  AutoCorrect: "False"

So neither False nor false will work, which is counter-intuitive for this parameter.
2. When the parameter is added in .rubocop.yml, RuboCop prints a warning, e.g.:

Warning: unrecognized parameter Style/StringLiterals:AutoCorrect found in /home/jonas/dev/rubocop/.rubocop.yml

[rrosenblum]

I saw the issue with the string false earlier and I hadn't gotten a chance to write up the issue yet. I am glad to see that someone else found it as well.