It is precisely because of this number of operators that I would like to document the functions related to them. 

When you read SQL and there is an operator, you need to think, "Did I use the right operator? I'll check the documentation to see if that's the one." 

If I use a word, I have no doubt. The word Diff is completely different than the word Equal, but the operator != is very similar to the operator =

Maybe we can find a way to have both on DOCs.

Maybe put function name just after operator definition
jsonb @> jsonb → boolean (jsonb_contains())

Maybe a tooltip on that operator.

I don't know how, but from a user's point of view, I know that not documenting isn't the best approach.

regards

Marcos