docs(Readme): Update multiple values example

README.md

@@ -133,10 +133,12 @@ Also, see [templating](#templating) and [example](#examples) sections.
 2. Template with multiple values:
     ```shell
     $ cat example.yaml
-    image: nginx:stable-alpine #yampl {{ repo current }}:{{ .tag }}
-    $ yampl example.yaml -v tag=stable
-    image: nginx:stable #yampl {{ repo current }}:{{ .tag }}
+    image: nginx:stable-alpine #yampl {{ .repo }}:{{ .tag }}
+    $ yampl example.yaml -v repo=docker.io/nginx -v tag=stable
+    image: docker.io/nginx:stable #yampl {{ .repo }}:{{ .tag }}
     ```
+   > [!NOTE]
+   > All variables must be set or else a node will remain unchanged.
 
 3. Using a [Sprig](https://masterminds.github.io/sprig/) function:
     ```shell