Add elided lifetimes to view helpers in examples

examples/markdown/overview.md

@@ -34,7 +34,7 @@ Now, let's show the actual counter by putting it all together in our __view logi
 use iced::widget::{button, column, text, Column};
 
 impl Counter {
-    pub fn view(&self) -> Column<Message> {
+    pub fn view(&self) -> Column<'_, Message> {
         // We use a column: a simple vertical layout
         column![
             // The increment button. We tell it to produce an

examples/markdown/src/main.rs

@@ -174,7 +174,7 @@ impl Markdown {
         }
     }
 
-    fn view(&self) -> Element<Message> {
+    fn view(&self) -> Element<'_, Message> {
         let editor = text_editor(&self.raw)
             .placeholder("Type your Markdown here...")
             .on_action(Message::Edit)