used 'Enumerator#with_index' to detect lineno. #1615
Merged
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used 'Enumerator#with_index' to detect lineno.
before: Defined a variable called lineno to count up for each loop.
after: Fixed it.' Enumerator#with_index'.
Rouge::Formatters is often referenced by developers when creating Custom Formatters, so I think it should be written in a better Ruby way.
and fix block scope variable name.(Adjusted variable names to match those used in other files.)