Syntax rules for the first character in outer doc comments

§2.5 (fls_q8l2jza7d9xa) provides the following syntax rules for outer-doc comments:

OuterBlockDoc ::=
    /** (~[*] | BlockCommentOrDoc) (BlockCommentOrDoc | ~[*/ \r])* */

OuterLineDoc ::=
    /// (~[/] ~[\n \r]*)?

The ~[*] and ~[/] expressions are there to say that /*** ... */ and //// ... aren't doc comments.

But those expressions match too broadly: they accept LF and CR, which they shouldn't (the notation ~[X] is defined in §1.1.4:14 (fls_blvsfqeevosr) and means to match a single character other than X).

That means that the syntax rules say, for example, that the following input is a single OuterLineDoc:

///
x = 1

Similarly the syntax rules say /**␍ */ (where ␍ represents a CR control character) is accepted as an OuterBlockDoc, although a CR in any other position inside the comment would mean the input wasn't accepted.

The Reference has equivalent syntax rules, so it has the same bug.

Start with the outer-doc syntax rules in §2.5 and the equivalent rules in the Reference. Check the first-character exclusions for LF and CR, then update both rule sets so those characters are not accepted there while preserving valid outer comments.