docs: update methods example (#267)

Co-authored-by: Adrian Hesketh <a-h@users.noreply.github.com>

docs/docs/04-core-concepts/01-components.md

@@ -57,3 +57,31 @@ func main() {
 This code is unsafe! In code-only components, you're responsible for escaping the HTML content yourself, e.g. with the `templ.EscapeString` function.
 :::
 
+## Method components
+
+templ components can be returned from methods (functions attached to types).
+
+Go code:
+
+```
+package main
+
+type Data struct {
+	message string
+}
+
+templ (d Data) Method() {
+	<div>{ d.message }</div>
+}
+
+func main() {
+	d := Data{
+		message: "You can implement methods on a type.",
+	}
+	d.Method().Render(context.Background(), os.Stdout)
+}
+```
+
+
+
+