Clean up Element API and start on docs

crates/command_palette2/src/command_palette.rs

@@ -83,9 +83,9 @@ impl FocusableView for CommandPalette {
 }
 
 impl Render for CommandPalette {
-    type Element = Div;
+    type Output = Div;
 
-    fn render(&mut self, _cx: &mut ViewContext<Self>) -> Self::Element {
+    fn render(&mut self, _cx: &mut ViewContext<Self>) -> Self::Output {
         v_stack().w(rems(34.)).child(self.picker.clone())
     }
 }