docs: fix docker-env-setup.md

[peng-yq]

Relevant Issue (if applicable)

1633

Details

Just fix the manual.

Types of changes

What types of changes does your PullRequest introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation Update (if none of the other choices apply)

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.

[imeoer]

@peng-yq Let's pass the DCO check with git commit -s. :)

[imeoer]

@peng-yq Please also submit a PR to master branch, thanks!

[peng-yq]

@peng-yq Please also submit a PR to master branch, thanks!

Sure! I'll check the manual of the master branch.

[peng-yq]

@imeoer , Already submit a PR to the master branch #1645.