Description

Hello,

Documentation on how to upgrade to Ops Manager 4.2 and 4.1 opens without problem. Versions 4.0 and below give 404 error. For example:

https://docs.opsmanager.mongodb.com/v4.0/tutorial/upgrade-ops-manager/

```
404 Not Found

Code: NoSuchKey
Message: The specified key does not exist.
Key: v4.0/tutorial/upgrade-ops-manager/index.html
RequestId: 1324675B3653AB6B
HostId: RfIPHVyjUTCUMaGxL55+x7tOq5aRTdwKVTrPB7vUot0Qt8RX5/AzYe487dQQiqB1v2unsbeqlXg=
```

https://docs.opsmanager.mongodb.com/v3.6/tutorial/upgrade-ops-manager/

```
404 Not Found

Code: NoSuchKey
Message: The specified key does not exist.
Key: v3.6/tutorial/upgrade-ops-manager/index.html
RequestId: 0C898991A43498CA
HostId: ZgV3CUO8dYlq8OZ7UFidCUAFWkbIr00tBEaXlJl+ERG+lUuO+Gp5t7rx6ztVVKfkKKCzPu0AVas=
```

And so on.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)