Merge pull request #6429 from mika/patch-1

Fix missing leading slash for /bin/bash executable
Upstream-commit: 93bf556f1344e7842532b2bfdb8ec6209c5b391b
Component: engine

components/engine/docs/sources/introduction/understanding-docker.md

@@ -208,7 +208,7 @@ is:
 * What Docker image to build the container from, here `ubuntu`, a base Ubuntu
 image; 
 * The command you want to run inside the container when it is launched,
-here `bin/bash`, to start the Bash shell inside the new container.
+here `/bin/bash`, to start the Bash shell inside the new container.
 
 So what happens under the hood when we run this command?