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The canonical place is the Sage Trac, but you need an account for that. If you have a Github account you could create a pull request or something at the Github page, and the sage-support Google group will get some attention as well.

In this case, I would first check that the typo is still extant. In this case, it appears to be, so I've reported a fix here - a one-character change ought to do it, though there are other issues in the file as well.