🏑 Doc version fix (#500)

## Describe your changes
Doc version fix for new release package.

## Checklist before requesting a review
- [ ] Add unit tests for this change.
- [ ] Make sure all tests can pass.
- [ ] Update documents if necessary.
- [ ] Format your code by running `pre-commit run --all-files`
- [ ] Is this a user-facing change? If yes, give a description of this
change to be included in the release notes.

## (Optional) Issue link

.azure_pipelines/build-doc.yaml

@@ -61,7 +61,6 @@ stages:
           git checkout gh-pages
           git rm -rf ${{parameters.doc_version}}
           mkdir ${{parameters.doc_version}}
-          ls -d */ | grep -E "[0-9]+\.[0-9]+\.[0-9]+" | xargs -I {} cp ./_static/js/custom_version.js {}/_static/js/
         displayName: Checkout gh-pages branch
         condition: ne('${{parameters.doc_version}}', 'latest')
 
@@ -76,6 +75,7 @@ stages:
 
       # commit and push the docs
       - script: |
+          ls -d */ | grep -E "[0-9]+\.[0-9]+\.[0-9]+" | xargs -I {} cp ./_static/js/custom_version.js {}_static/js/
           git add -A
           git commit -m "Update docs from $(Build.SourceVersion)"
           git push origin gh-pages