docs: Update to match current admin.js
docs: Update to match current admin.js

Made some small changes to documentation to match the code in the
current admin.js

Fixes: There was no related issue for this fix.

zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip