Update File mount info for docker v1.1.0

Docker-DCO-1.1-Signed-off-by: Tom Fotherby <github@tomfotherby.com> (github: tomfotherby)

docs/sources/userguide/dockervolumes.md

@@ -78,13 +78,12 @@ As well as directories, the `-v` flag can be used to mount a single file from th
     $ sudo docker run --rm -it -v ~/.bash_history:/.bash_history ubuntu /bin/bash
 
 This will drop you into a bash shell in a new container, you will have your bash history from your host and when 
-you exit the container the host will have the history of the commands typed while in the container.
+you exit the container, the host will have the history of the commands typed while in the container.
 
 > **Note:** 
-> The two-way binding of the mounted file will only be preserved as long as the inode doesn't change. Many
-> tools used to edit files including `vi` and `sed --in-place` may result in a inode change. In the case where you
-> want to edit the file, it is often best to mount the parent directory.
-
+> Many tools used to edit files including `vi` and `sed --in-place` may result in a inode change. Since docker v1.1.0
+> this will produce a error such as "*sed: cannot rename ./sedKdJ9Dy: Device or resource busy*". In the case where you
+> want to edit the mounted file, it is often easiest to instead mount the parent directory.
 
 ## Creating and mounting a Data Volume Container