[doc] add warning for torch fsdp plugin doc

[wukong1992]

📌 Checklist before creating the PR

• I have created an issue for this PR for traceability
• The title follows the standard format: [doc/gemini/tensor/...]: A concise description
• I have added relevant tags if possible for us to better distinguish different PRs

🚨 Issue number

Link this PR to your issue with words like fixed to automatically close the linked issue upon merge

e.g. fixed #1234, closed #1234, resolved #1234

📝 What does this PR do?

add warning for torch fsdp plugin doc: now fsdp not support optimizer that use multi params group
if you have any plots/diagrams/screenshots/tables, please attach them here.

💥 Checklist before requesting a review

• I have linked my PR to an issue (instruction)
• My issue clearly describes the problem/feature/proposal, with diagrams/charts/table/code if possible
• I have performed a self-review of my code
• I have added thorough tests.
• I have added docstrings for all the functions/methods I implemented

⭐️ Do you enjoy contributing to Colossal-AI?

• 🌝 Yes, I do.
• 🌚 No, I don't.

Tell us more if you don't enjoy contributing to Colossal-AI.

[github-actions]

The code coverage for the changed files is 86%.

Click me to view the complete report

Name                                             Stmts   Miss  Cover
--------------------------------------------------------------------
colossalai/booster/plugin/torch_fsdp_plugin.py      96     13    86%
--------------------------------------------------------------------
TOTAL                                               96     13    86%