feat(frontend): Add mobile browser date search terms (#1818)

Adds search autocompletion for `available_date` on mobile browsers:
- chrome_android
- firefox_android
- safari_ios

Also corrects the documentation for the `available_on:chrome_android` search term.

Author: jcscottiii

frontend/src/static/js/utils/constants.ts

@@ -191,6 +191,18 @@ export const VOCABULARY = [
     name: 'available_date:safari:2023-01-01..2024-01-01',
     doc: 'Became available on Safari between the given dates',
   },
+  {
+    name: 'available_date:chrome_android:2023-01-01..2024-01-01',
+    doc: 'Became available on Chrome Android between the given dates',
+  },
+  {
+    name: 'available_date:firefox_android:2023-01-01..2024-01-01',
+    doc: 'Became available on Firefox between the given dates',
+  },
+  {
+    name: 'available_date:safari_ios:2023-01-01..2024-01-01',
+    doc: 'Became available on Safari iOS between the given dates',
+  },
   {
     name: 'available_on:chrome',
     doc: 'Features available on Chrome',
@@ -209,7 +221,7 @@ export const VOCABULARY = [
   },
   {
     name: 'available_on:chrome_android',
-    doc: 'Features available on Chrome',
+    doc: 'Features available on Chrome Android',
   },
   {
     name: 'available_on:firefox_android',