Merge branch '5.2' into 5.x

* 5.2: Add Oracle DATABASE_URL instruction

Author: javiereguiluz

doctrine.rst

@@ -54,6 +54,9 @@ The database connection information is stored as an environment variable called
 
  # to use postgresql:
  # 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@127.0.0.1:1521/db_name"
 
 .. caution::