Trivial spelling correction

Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Reviewed-by: Emanuele Aina <emanuele.aina@collabora.com>
Differential Revision: https://phabricator.apertis.org/D7552

README

@@ -39,7 +39,7 @@ debos --scratchsize 10G -t type:sdk -t suite:18.03 apertis-image-sdk.yaml
 Building in docker
 ==================
 
-To ease testing on a wide variaty of host systems (and building in Jenkins) a
+To ease testing on a wide variety of host systems (and building in Jenkins) a
 docker file is provided which sets up the build environment. To build using
 that: