* lisp/help-fns.el (help--symbol-class): Concat chars for all namespaces.

* lisp/help-fns.el (help--symbol-class): Concat chars for all namespaces.

Since Emacs Lisp is more than Lisp-2, separately output letters
for each namespace: functions, variables, faces, classes.
Use non-letter characters for additional properties
such as advice, obsolete, local.
(help--symbol-completion-table-affixation): Use format "%-4s".
https://lists.gnu.org/archive/html/emacs-devel/2021-06/msg00524.html