Github user cocoatomo commented on the pull request:
https://github.com/apache/spark/pull/2766#issuecomment-58769648
Thank you for the comment.
I'm also happy that Jenkins checks this kind of issue rather than me.
-W option of sphinx-build would help us to check and report errors strictly.
http://sphinx-doc.org/invocation.html#cmdoption-sphinx-build-W
It is used through a make command such like:
```bash
$ SPHINXOPTS=-W make clean html
```
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