Avoid watching all states in the default template (#6918)

src/panels/developer-tools/template/developer-tools-template.ts

@@ -31,10 +31,9 @@ The temperature is {{ my_test_json.temperature }} {{ my_test_json.unit }}.
   The sun will rise at {{ as_timestamp(strptime(state_attr("sun.sun", "next_rising"), "")) | timestamp_local }}.
 {%- endif %}
 
-For loop example getting 3 entity values:
+For loop example getting entity values in the weather domain:
 
-{% for states in states | slice(3) -%}
-  {% set state = states | first %}
+{% for state in states.weather -%}
   {%- if loop.first %}The {% elif loop.last %} and the {% else %}, the {% endif -%}
   {{ state.name | lower }} is {{state.state_with_unit}}
 {%- endfor %}.`;