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                        [V3] Boolean vs boolean
exercism/v3#2281 has a discussion started about referencing "Boolean" and "boolean" and the problems that can be associated with using "boolean" and the formal true and false being listed when we don't really mean that as a requirement.
The comments came about from the issue above, while the details are found here and here.
The Concept is "Boolean" and includes the less formal 'boolean' as well, for being subject complete.
Files effected:
./languages/ruby/exercises/concept/booleans/.docs/instructions.md
Suggestion is to remove the true/false reference, or capitalize the B in boolean.