Correction of default port

Author: hosseinvakili

doctrine.rst

@@ -56,7 +56,7 @@ The database connection information is stored as an environment variable called
     # DATABASE_URL="postgresql://db_user:db_password@127.0.0.1:5432/db_name?serverVersion=11&charset=utf8"
     
     # to use oracle:
-    # DATABASE_URL="oci8://db_user:db_password@127.0.0.1:1234/db_name"
+    # DATABASE_URL="oci8://db_user:db_password@127.0.0.1:1521/db_name"
 
 .. caution::