Update owner provider documentation

src/rebar3_hex_owner.erl

@@ -161,16 +161,14 @@ support() ->
     "publish and revert releases and even remove other package owners.~n~n"
     "Supported command combinations: ~n~n"
     "  rebar3 hex owner add <package> <username>~n~n"
-    "  rebar3 hex owner add <package> <username> <level>~n~n"
-    "  rebar3 hex owner add <package> <username> <level> <transfer>~n~n"
+    "  rebar3 hex owner add <package> <username> --level <level>~n~n"
     "  rebar3 hex owner list <package>~n~n"
     "  rebar3 hex owner remove <package> <username>~n~n"
     "  rebar3 hex owner transfer <package> <username>~n~n"
     "Argument descriptions: ~n ~n"
     "  <username> - a valid hex username or email address for a hex user~n~n"
     "  <package>  - a valid hex package name~n~n"
     "  <level>    - one of full or maintainer~n~n"
-    "  <transfer> - boolean value indicating whether to transfer a specified package or not~n~n".
 
 %% @private
 -spec format_error(any()) -> iolist().