docs

* ProcedureQuery
(cherry picked from commit b515e35c3a4b02070174015e43ef64f3da3a2276)

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-3.1@1447814 13f79535-47bb-0310-9956-ffa450edef68