Linter rule messages are very generic

[lee-chase]

As mentioned in #104 the messages displayed by the linter rule are very generic

e.g.
Expected carbon type token, mixin or function to be set for variable "$spacing-07" used by "line-height" found "an unknown, undefined or unrecognized value". carbon/type-token-use

A more specific message could in many cases would allow users to understand and address issues raised by the linter rule.

e.g.
Line-height shouldn't be set directly. Use the typography.type-style() mixin instead. carbon/type-token-use