Fix a typo in the Diffusion importing user guide

Summary: This word isn't the right word.

Test Plan: Reading?

Reviewers: avivey, amckinley

Reviewed By: avivey

Differential Revision: https://secure.phabricator.com/D19404

src/docs/user/userguide/diffusion_existing.diviner

@@ -47,7 +47,7 @@ There are two primary ways to import an existing repository:
 Once the import completes, change the "I/O Type" on the **Observe** URI to
 "No I/O" mode to automatically convert it into a hosted repository.
 
-**Push to Empty Repository**: Create an activate an empty repository, then push
+**Push to Empty Repository**: Create and activate an empty repository, then push
 all of your changes to the empty repository.
 
 In Git and Mercurial, you can do this with `git push` or `hg push`.