fix comment punctuations

Author: kroikie

messaging/app/src/main/java/com/google/firebase/example/messaging/MainActivity.java

@@ -119,8 +119,8 @@ private void askNotificationPermission() {
         } else if (shouldShowRequestPermissionRationale(Manifest.permission.POST_NOTIFICATIONS)) {
             // TODO: display an educational UI explaining to the user the features that will be enabled
             //       by them granting the POST_NOTIFICATION permission. This UI should provide the user
-            //       "OK" and "No thanks" buttons. If the user selects "OK" directly request the permission.
-            //       If the user selects "No thanks" allow the user to continue without notifications.
+            //       "OK" and "No thanks" buttons. If the user selects "OK," directly request the permission.
+            //       If the user selects "No thanks," allow the user to continue without notifications.
         } else {
             // Directly ask for the permission
             requestPermissions(new String[] { Manifest.permission.POST_NOTIFICATIONS }, NOTIFICATION_REQUEST_CODE);
@@ -140,7 +140,7 @@ public void onRequestPermissionsResult(int requestCode, String[] permissions,
                         grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     // FCM SDK (and your app) can post notifications.
                 } else {
-                    // TODO: Inform user that that your app will not show notifications
+                    // TODO: Inform user that that your app will not show notifications.
                 }
                 return;
         }

messaging/app/src/main/java/com/google/firebase/example/messaging/kotlin/MainActivity.kt

@@ -106,8 +106,8 @@ class MainActivity : AppCompatActivity() {
         } else if (shouldShowRequestPermissionRationale(Manifest.permission.POST_NOTIFICATIONS)) {
             // TODO: display an educational UI explaining to the user the features that will be enabled
             //       by them granting the POST_NOTIFICATION permission. This UI should provide the user
-            //       "OK" and "No thanks" buttons. If the user selects "OK" directly request the permission.
-            //       If the user selects "No thanks" allow the user to continue without notifications.
+            //       "OK" and "No thanks" buttons. If the user selects "OK," directly request the permission.
+            //       If the user selects "No thanks," allow the user to continue without notifications.
         } else {
             // Directly ask for the permission
             requestPermissions(arrayOf(Manifest.permission.POST_NOTIFICATIONS), NOTIFICATION_REQUEST_CODE)
@@ -124,7 +124,7 @@ class MainActivity : AppCompatActivity() {
                 if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     // FCM SDK (and your app) can post notifications.
                 } else {
-                    // TODO: Inform user that that your app will not show notifications
+                    // TODO: Inform user that that your app will not show notifications.
                 }
                 return
             }