What's new: add second page of info for sdk30 storage update

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/java/com/nextcloud/client/onboarding/OnboardingServiceImpl.kt

@@ -54,6 +54,12 @@ internal class OnboardingServiceImpl constructor(
                     R.string
                         .whats_new_storage_sdk30_content,
                     true, false
+                ),
+                FeatureItem(
+                    R.drawable.folder_alert_outline, R.string.whats_new_storage_sdk30_title,
+                    R.string
+                        .whats_new_storage_sdk30_content_page2,
+                    true, false
                 )
             )
         } else {

src/main/res/values/strings.xml

@@ -1006,4 +1006,7 @@
     <string name="whats_new_storage_sdk30_content">From Android 11 onwards, strict storage access
         control is enforced.\n\nAs a consequence, Nextcloud will no longer be able to delete or write files on
         external storage, or read files in private folders owned by other apps.</string>
+    <string name="whats_new_storage_sdk30_content_page2">Please check your auto upload items and verify
+    that Nextcloud still has read access to the local folder.\n\nAdditionally, other applications will not be able to
+    read Nextcloud\'s downloaded files directly from the external storage.</string>
 </resources>