chore(docs): incorrect path in .readthedocs.yaml (#3401)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

.readthedocs.yaml

@@ -15,7 +15,7 @@ build:
     - asdf global uv latest
     - uv venv
     - cd docs && UV_INDEX_STRATEGY=unsafe-first-match uv pip install -r requirements.lock
-    - cd docs/ && ls -la && NO_COLOR=1 ../.venv/bin/mkdocs build --strict --site-dir $READTHEDOCS_OUTPUT/html --config-file docs/mkdocs.yml
+    - cd docs/ && ls -la && NO_COLOR=1 ../.venv/bin/mkdocs build --strict --site-dir $READTHEDOCS_OUTPUT/html --config-file mkdocs.yml