[NFC][libc] Clarifies underscores in n-char-sequence. (#102193)
The C standard specifies
n-char-sequence:
digit
nondigit
n-char-sequence digit
n-char-sequence nondigit
nondigit is specified as one of:
_ a b c d e f g h i j k l m
n o p q r s t u v w x y z
A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z
This means nondigit includes the underscore character. This patch
clarifies this status in the comments and the test.
Note C17 specifies n-char-sequence for NaN() as optional, and an empty
sequence is not a valid n-char-sequence. However the current comment has
the same effect as using the pedantic wording. So I left that part
unchanged.
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