exclude private predicates

Author: erik-krogh

ql/ql/src/queries/style/docs/PredicateDocs.ql

@@ -17,6 +17,7 @@ string docLines(Predicate pred) {
 
 from Predicate pred, string message
 where
+  not pred.isPrivate() and
   // only considering qldocs that look like a class-doc, to avoid reporting way too much.
   docLines(pred).matches(["A", "An", "The"] + " %") and // looks like a class doc.
   not pred instanceof NewTypeBranch and // <- these are actually kinda class-like.