docs(concepts): Fix the example to add .flox to Git (#283)

Author: sschuberth

docs/concepts/flox-vs-containers.md

@@ -267,7 +267,7 @@ same environment.
     you can simply check this directory into source control.
 
     ```bash
-    $ git add ./flox
+    $ git add .flox
     $ git commit -m "Add Flox environment"
     $ git push
     ```