Missing DM not natively supported in operator v2 and a v1-v2 gap

[pdbossman]

Change Request

This repository is ONLY used to solve issues related to TiDB Operator documentation.
For other issues (related to TiDB, PD, etc), please move to other repositories.

Please answer the following questions before submitting your issue. Thanks!

1. Describe what you find is inappropriate or missing in the existing docs.

DM is not natively supported in V2. Is not included in v1 - v2 documentations gaps

2. Describe your suggestion or addition.

Add DM as a documentation gap. Make sure all of the gaps on this page have items in operator v2 roadmap linked from main operator page.

3. Provide some reference materials (documents, websites, etc) if you could.

The main operator page lists this as the link for v2 roadmap:
https://github.com/pingcap/tidb-operator/tree/main/docs/rfcs

[Oreoxmt]

@liubog2008 Could you please take a look at this issue? Thanks!