doc/tutorial/kubernetes: move testdata directory

Later we'll use the testdata directory for golden
test files.

Change-Id: I00c82b1745087dc875727b4cb6e0a6db5e1b02a9
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2240
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/doc/tutorial/kubernetes/README.md b/doc/tutorial/kubernetes/README.md
index 8e078d8..2bc87aa 100644
--- a/doc/tutorial/kubernetes/README.md
+++ b/doc/tutorial/kubernetes/README.md
@@ -65,7 +65,7 @@
 We first make a copy of the data directory.
 
 ```
-$ cp -a testdata tmp
+$ cp -a original tmp
 $ cd tmp/services
 ```