docs: update examples to use llama3.1 (#6718)

docs/template.md

@@ -33,7 +33,7 @@ Omitting a template in these models puts the responsibility of correctly templat
 To add templates in your model, you'll need to add a `TEMPLATE` command to the Modelfile. Here's an example using Meta's Llama 3.
 
 ```dockerfile
-FROM llama3
+FROM llama3.1
 
 TEMPLATE """{{- if .System }}<|start_header_id|>system<|end_header_id|>