Add descriptions to automation page sections (#19081)

* Add descriptions to automation page sections

* add name key

* Update manual-automation-editor.ts

* hide explanation if there is content

* Update src/translations/en.json

* hide when advanced

src/panels/config/script/ha-script-editor.ts

@@ -538,7 +538,7 @@ export class HaScriptEditor extends KeyboardShortcutMixin(LitElement) {
       value.valid
         ? ""
         : html`${this.hass.localize(
-              `ui.panel.config.automation.editor.${key}s.header`
+              `ui.panel.config.automation.editor.${key}s.name`
             )}:
             ${value.error}<br />`
     );