[Standards] [XEP-0433] (Extended Channel Search): Search Form Fields

Hi, I'm currently implementing XEP-0433 (Extended Channel Search), nice work thanks. I have a couple of feedback: 1. I see in example 3 (https://xmpp.org/extensions/xep-0433.xml#example-3) a `min_users` field which is not described in https://xmpp.org/extensions/ xep-0433.xml#table-1, would it be possible to add it? 2. I think that it would be nice to specify recommended default values in the table. 3. The "sort" field is redundant and less powerful than XEP-0413 (Order-By), is there any reason to not use the later? 4. I feel that it would be useful to indicate somewhere the minimum of characters expected in a search query, so client doesn't send useless requests. Maybe via disco? Thanks! Goffi