data: update readme

There isn't any sanitization here; the data is available to anyone with
an account and the details on my user.json file are fine.

data/README.md

@@ -2,6 +2,3 @@
 
 Store example Gitlab objects here. The filename should generally correlate with
 what the object stored within it is.
-
-All URLs in example objects should be rewritten to be underneath the
-`example.com` domain.