Add exclude query rule type to specification

[kderusso]

The exclude query rule type will go live with 8.16.0, this PR updates the specification accordingly.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
query_rules.delete_rule	🟢	6/6	6/6
query_rules.delete_ruleset	🟢	7/7	7/7
query_rules.get_rule	🟢	5/5	5/5
query_rules.get_ruleset	🟢	8/8	8/8
query_rules.list_rulesets	🟢	7/7	7/7
query_rules.put_rule	🟢	7/7	7/7
query_rules.put_ruleset	🟢	13/13	13/13

You can validate these APIs yourself by using the make validate target.

[pquentin]

Thanks! LGTM.