[Doc] update hotUpgrade doc

[Zephyrcf]

Overview

Please briefly describe the changes your pull request makes. update hotUpgrade doc.

Related Issues

Please link to the relevant issue. For example: Fix #123 or Related #456.

Related https://github.com/dragonflyoss/nydus/issues/1698

Change Details

Please describe your changes in detail:

Test Results

If you have any relevant screenshots or videos that can help illustrate your changes, please add them here.

Change Type

Please select the type of change your pull request relates to:

• [ ] Bug Fix
• [ ] Feature Addition
• [x] Documentation Update
• [ ] Code Refactoring
• [ ] Performance Improvement
• [ ] Other (please describe)

Self-Checklist

Before submitting a pull request, please ensure you have completed the following:

• [ ] I have run a code style check and addressed any warnings/errors.
• [ ] I have added appropriate comments to my code (if applicable).
• [ ] I have updated the documentation (if applicable).
• [ ] I have written appropriate unit tests.

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.

[github-actions[bot]]

This PR was closed because it has been stalled for 7 days with no activity.

[imeoer]

Hi @Zephyrcf Any updates on the PR yet?