Parser.Fixed.Lexer: fix a wonky comment

From discussion in #257, this comment was unclear, or perhaps talking
about the wrong thing.

Author: raehik

src/Language/Fortran/Parser/Fixed/Lexer.x

@@ -943,7 +943,7 @@ alexGetByte ai
   | posAbsoluteOffset _position == aiEndOffset ai = Nothing
   -- Skip the continuation line altogether
   | isContinuation ai && _isWhiteInsensitive = skip Continuation ai
-  -- Skip the newline before a comment
+  -- Skip comment lines "between" continuations
   | aiFortranVersion ai >= Fortran77 && _isWhiteInsensitive
   && isNewlineCommentsFollowedByContinuation ai = skip NewlineComment ai
   -- If we are not parsing a Hollerith skip whitespace