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[Scheme-reports] Issues with <comment> grammar rule

In the grammar of the sixth "small" draft, I noticed two small issues for the
<comment> rule (section 7.1.1).

1) In the first choice of the <comment> rule, it lists <all subsequent
characters up to a line break>.  However, the spec does not define exactly
what constitutes a line break.

2) The third choice of the rule uses <atmosphere> to separate `#;' from the
datum it comments.  However, the <atmosphere> rule will match exactly one
comment or whitespace character, which is surely not what is intended.  This
could be fixed by using <intertoken space> in its place.

- Michael Morgan

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