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Fix comment in findSubString #37

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Janiczek
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This comment isn't in line with what the code actually does, and given code can't lie but comments can, the place to fix is probably the comment.

See findSubString - the newOffset + smallString.length means the target is pointed at the end of the found substring, not at its beginning.

--    v = newOffset
  "Is 42 the answer?"
--      ^ = newOffset + smallString.length
-- 1234567...

This comment isn't in line with what the code actually does, and given code can't lie but comments can, the place to fix is probably the comment.

See [findSubString](https://github.com/elm/parser/blob/master/src/Elm/Kernel/Parser.js#L123) - the `newOffset + smallString.length` means the target is pointed at the end of the found substring, not at its beginning.
```elm
--    v = newOffset
  "Is 42 the answer?
--      ^ = newOffset + smallString.length
-- 1234567...
```
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