Document 'any' argument and result type, useful for internal commands

Also 'atom' may be used as argument type by some internal commands,
for example the ones that refer to erlang node names.

include/ejabberd_commands.hrl

@@ -19,13 +19,18 @@
 %%%----------------------------------------------------------------------
 
 -type aterm() :: {atom(), atype()}.
--type atype() :: integer | string | binary |
+-type atype() :: integer | string | binary | any | atom |
                  {tuple, [aterm()]} | {list, aterm()}.
 -type rterm() :: {atom(), rtype()}.
--type rtype() :: integer | string | atom |
+-type rtype() :: integer | string | atom | any |
                  {tuple, [rterm()]} | {list, rterm()} |
                  rescode | restuple.
 
+%% The 'any' and 'atom' argument types and 'any' result type
+%% should only be used %% by commands with tag 'internal',
+%% which are meant to be used only internally in ejabberd,
+%% and not called using external frontends.
+
 %% The purpose of a command can either be:
 %% - informative: its purpose is to obtain information
 %% - modifier: its purpose is to produce some change in the server

src/ejabberd_ctl.erl

@@ -976,11 +976,14 @@ format_usage_ctype1({Name, Type, Description}, Indentation, ShCode) ->
 
 
 format_usage_ctype(Type, _Indentation)
-  when (Type==atom) or (Type==integer) or (Type==string) or (Type==binary) or (Type==rescode) or (Type==restuple)->
+  when (Type==atom) or (Type==integer) or (Type==string) or (Type==binary)
+       or (Type==rescode) or (Type==restuple) ->
     io_lib:format("~p", [Type]);
 
 format_usage_ctype({Name, Type}, _Indentation)
-  when (Type==atom) or (Type==integer) or (Type==string) or (Type==binary) or (Type==rescode) or (Type==restuple)->
+  when (Type==atom) or (Type==integer) or (Type==string) or (Type==binary)
+       or (Type==rescode) or (Type==restuple)
+       or (Type==any) ->
     io_lib:format("~p::~p", [Name, Type]);
 
 format_usage_ctype({Name, {list, ElementDef}}, Indentation) ->