Reword error messages for pganalyze.explain_analyze helper per feedback

util/explain_analyze_helper.sql

@@ -11,19 +11,19 @@ BEGIN
 
   PERFORM 1 FROM pg_roles WHERE (rolname = current_user AND rolsuper) OR (pg_has_role(oid, 'MEMBER') AND rolname IN ('rds_superuser', 'azure_pg_admin', 'cloudsqlsuperuser'));
   IF FOUND THEN
-    RAISE EXCEPTION 'cannot run: pganalyze.explain_analyze helper function is owned by superuser - recreate function with lesser privileged user';
+    RAISE EXCEPTION 'cannot run: helper is owned by superuser - recreate function with lesser privileged user';
   END IF;
 
   SELECT pg_catalog.regexp_replace(query, ';+\s*\Z', '') INTO prepared_query;
   IF prepared_query LIKE '%;%' THEN
-    RAISE EXCEPTION 'cannot run pganalyze.explain_analyze helper function when query contains semicolon';
+    RAISE EXCEPTION 'cannot run helper with a multi-statement query';
   END IF;
 
   explain_prefix := 'EXPLAIN (VERBOSE, FORMAT JSON';
   FOR explain_flag IN SELECT * FROM unnest(analyze_flags)
   LOOP
     IF explain_flag NOT SIMILAR TO '[A-z_ ]+' THEN
-      RAISE EXCEPTION 'cannot run pganalyze.explain_analyze helper function with invalid flag';
+      RAISE EXCEPTION 'cannot run helper with invalid flag';
     END IF;
     explain_prefix := explain_prefix || ', ' || explain_flag;
   END LOOP;