Remove obsolete Tramp items

Remove obsolete Tramp items

* etc/NEWS: Obsolete user option
'tramp-completion-reread-directory-timeout' has been removed.  Fix typos.

* lisp/net/tramp-archive.el (tramp-archive-file-name-handler-alist):
Ignore `make-directory-internal'.

* lisp/net/tramp-sh.el (tramp-get-remote-trash): Remove.

* lisp/net/tramp-smb.el (tramp-smb-handle-make-directory-internal):
Remove.

* lisp/net/tramp.el (tramp-default-user): Fix docstring.
(tramp-completion-reread-directory-timeout): Remove.