fix typo on project page

Issue Summary

This is a tiny thing (and I would have fixed it myself but I don't think I can edit your project page), but it does make the page a little hard to read:

In the second paragraph, change the third sentence:

Note only can it push new content, it can also push updates to existing content.

to

Not only can it push new content, it can also push updates to existing content.

(Or even: It can push new content and also push updates to existing content.)

Thanks!