Fix typo in Using Chef documentation description

Docker-DCO-1.1-Signed-off-by: Brian Flad <bflad417@gmail.com> (github: bflad)

docs/sources/use/chef.rst

@@ -1,5 +1,5 @@
 :title: Chef Usage
-:description: Installating and using Docker via Chef
+:description: Installation and using Docker via Chef
 :keywords: chef, installation, usage, docker, documentation
 
 .. _install_using_chef: