Tiny typo cleanup

docs/sources/use/working_with_volumes.rst

@@ -45,7 +45,7 @@ Create a new container using existing volumes from an existing container:
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-The command below creates a new container which is runnning as daemon ``-d`` and with one volume ``/var/lib/couchdb``::
+The command below creates a new container which is running as daemon ``-d`` and with one volume ``/var/lib/couchdb``::
 
   COUCH1=$(sudo docker run -d -v /var/lib/couchdb shykes/couchdb:2013-05-03)