In docs example change home dir for work dir

I think user home dir works better instead of `-w "/usr/src/app"` use `-w "/home/node/app"`

Author: David Barton

docs/BestPractices.md

@@ -48,7 +48,7 @@ $ docker run \
   -e "NODE_ENV=production" \
   -u "node" \
   -m "300M" --memory-swap "1G" \
-  -w "/usr/src/app" \
+  -w "/home/node/app" \
   --name "my-nodejs-app" \
   node [script]
 ```