Merge pull request #203 from SSteve/patch-1

Typo: you -> your

Author: hjwp

chapter_09_docker.asciidoc

@@ -467,7 +467,7 @@ $ *git commit -m "Move all our code into a src folder"*
 
 The https://docs.docker.com/get-docker/[Docker documentation] is pretty good,
 and you'll find detailed installation instructions for Windows, Mac, and Linux.
-Follow those, and then test you installation by running:
+Follow those, and then test your installation by running:
 
 [subs="specialcharacters,quotes"]
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