Apply suggestions from code review

Author: owen-mc

go/ql/lib/ext/github.com.couchbase.gocb.model.yml

@@ -82,7 +82,6 @@ extensions:
       - ["group:gocb2", "AnalyticsResultRaw", True, "NextBytes", "", "", "Argument[receiver]", "ReturnValue", "taint", "manual"]
       - ["group:gocb2", "GetResult", True, "Content", "", "", "Argument[receiver]", "Argument[0]", "taint", "manual"]
       - ["group:gocb2", "LookupInResult", True, "ContentAt", "", "", "Argument[receiver]", "Argument[1]", "taint", "manual"]
-      - ["group:gocb2", "LookupInReplicaResult", True, "ContentAt", "", "", "Argument[receiver]", "Argument[1]", "taint", "manual"]
       - ["group:gocb2", "LookupInAllReplicasResult", True, "Next", "", "", "Argument[receiver]", "ReturnValue", "taint", "manual"]
       - ["group:gocb2", "MutateInResult", True, "ContentAt", "", "", "Argument[receiver]", "Argument[1]", "taint", "manual"]
       - ["group:gocb2", "QueryResult", True, "One", "", "", "Argument[receiver]", "Argument[0]", "taint", "manual"]

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/test_couchbase_gocb_v1.go

@@ -50,5 +50,6 @@ func test_couchbase_gocb_v1_Cluster(cluster *gocb.Cluster, aq *gocb.AnalyticsQue
 		return
 	}
 
-	sink(r3) // $ hasTaintFlow="r3"
+	hit := r3.Hits()[0]
+	sink(hit) // $ hasTaintFlow="hit"
 }

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/test_couchbase_gocb_v2.go

@@ -47,7 +47,7 @@ func test_couchbase_gocb_v2_Cluster(cluster *gocb.Cluster) {
 }
 
 func test_couchbase_gocb_v2_Scope(scope *gocb.Scope) {
-	r1, err := scope.Query("SELECT * FROM `travel-sample`", nil) // $ source
+	r1, err := scope.AnalyticsQuery("SELECT * FROM `travel-sample`", nil) // $ source
 
 	if err != nil {
 		return