remove out-of-date paragraph in readme

Author: dgoffredo

example/README.md

@@ -63,8 +63,6 @@ For example, the default value for `BASE_IMAGE` in this example is
 `nginx:1.23.1-alpine`, which indicates compatibility with Nginx 1.23.1 running
 on Alpine, as per [nginx:1.23.1-alpine][3].
 
-Setting `NGINX_IMAGE_TAG` to `1.23.1-alpine` would indicate compatibility with Nginx 1.23.1 running on Alpine, as per [nginx:1.23.1-alpine][3].
-
 Command Line Tools
 ------------------
 [bin/](bin/) contains the following scripts: