Connector tutorials under Connectors reference are for LB3

[dhmlau]

While the connectors can be used for both LB3 and LB4, the tutorials under the Connectors reference for LB4 are about LB3. It might cause confusion to the users.

Tutorials I'm referring to are:

• mongodb connector tutorial: https://loopback.io/doc/en/lb4/Connecting-to-MongoDB.html
• mysql connector tutorial: https://loopback.io/doc/en/lb4/Connecting-to-MySQL.html
• oracle connector tutorial: https://loopback.io/doc/en/lb4/Connecting-to-Oracle.html
• postgresql connector tutorial: https://loopback.io/doc/en/lb4/Connecting-to-PostgreSQL.html

There are probably more in the list.

[agnes512]

For those who work on the stories: see #4877 (comment)

[dhmlau]

Closing as done, since all the items in this epic are done.
Many thanks @agnes512!! 🙇