Correct document _type from cherry-picked forward port

Relates a34d1e5

Author: russcam

src/Tests/Document/Multiple/DeleteByQuery/DeleteByQueryApiTests.cs

@@ -224,7 +224,7 @@ public DeleteByQueryWithSlicesApiTests(IntrusiveOperationCluster cluster, Endpoi
 		protected override bool ExpectIsValid => true;
 		protected override int ExpectStatusCode => 200;
 
-		protected override string UrlPath => $"/{CallIsolatedValue}/project/_delete_by_query";
+		protected override string UrlPath => $"/{CallIsolatedValue}/doc/_delete_by_query";
 
 		protected override object ExpectJson =>
 			new