docs: Adds region tags and scale attribute (#1710)

* Fix: Adds region tags and scale attribute

Adds region tags for documentation; adds scale 1.5.

* Update index.ts

samples/advanced-markers-accessibility/index.ts

@@ -49,22 +49,25 @@ async function initMap() {
     tourStops.forEach(({position, title}, i) => {
         const pin = new PinElement({
             glyph: `${i + 1}`,
+            scale: 1.5,
         });
-
+        // [START maps_advanced_markers_accessibility_marker]
         const marker = new AdvancedMarkerElement({
             position,
             map,
             title: `${i + 1}. ${title}`,
             content: pin.element,
         });
-
+        // [END maps_advanced_markers_accessibility_marker]
+        // [START maps_advanced_markers_accessibility_event_listener]
         // Add a click listener for each marker, and set up the info window.
         marker.addListener('click', ({ domEvent, latLng }) => {
             const { target } = domEvent;
             infoWindow.close();
             infoWindow.setContent(marker.title);
             infoWindow.open(marker.map, marker);
         });
+        // [END maps_advanced_markers_accessibility_event_listener]
     });
 }