Fix typo

Signed-off-by: Sylvain Bellemare <sylvain@ascribe.io>
(cherry picked from commit 63aa03ce0a9d2390f684da3403c1cd0e004592d1)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/userguide/storagedriver/imagesandcontainers.md

@@ -70,7 +70,7 @@ first time you start an updated Docker daemon. After the migration is complete,
  all images and tags will have brand new secure IDs. 
 
 Although the migration is automatic and transparent, it is computationally 
-intensive. This means it and can take time if you have lots of image data. 
+intensive. This means it can take time if you have lots of image data.
 During this time your Docker daemon will not respond to other requests.
 
 A migration tool exists that allows you to migrate existing images to the new