inaccurate documentation for [[:ascii:]]

[Emanuele Torre]

The documentation for glob character classes is innacurate:

> Within [ and ], character classes can be specified  using the syntax
> [:class:], where class is one of the following classes defined in the
> POSIX standard:
>  alnum alpha ascii blank cntrl digit graph lower print punct space
>  upper word xdigit
> A character class matches any character belonging to that class.  The
> word character class matches letters, digits, and the character _.

Out of those classes, [:ascii:] and [:word:] are not defined by the
POSIX standard.

[:word:] is clarified, but [:ascii:] isn't, so it is easy to miss that
bash supports [:ascii:] when glancing that part of the documentation.

I think it should be clarified that bash supports all the standard
character classes, and that [:word:] and [:ascii:] are supported
extensions.

o/
 emanuele6