* lisp/eshell/em-glob.el (eshell-extended-glob): Fix docstring.
(eshell-glob-entries): Refer to '**/' in error (technically, '**' can
end a glob, but it means the same thing as '*'). (Bug#54470)
* test/lisp/eshell/em-glob-tests.el: New file.
* doc/misc/eshell.texi (Globbing): Document pattern-based globs.