API docs, macro object: "macro" marked as required

See https://www.zabbix.com/documentation/4.0/manual/api/reference/usermacro/object .

"macro" is listed as required both for host and global macros.
It does not seem to be needed when passing macro ID and value for "update" and "updateglobal" methods.

On the other hand, one has to pass globalmacroid and hostmacroid in such a case.