Change aspect ratio summary and footer text

Add more education for device user that setting aspect ratio has not
been tested by the app developer. Move Aspect ratio under Apps >
Advanced instead of General.

Fix: 296160724
Test: atest UserAspectRatioAppsPageProviderTest
Change-Id: I2078f285d7bfb8de3a61c69f9d0ff3872d683ed4

tests/spa_unit/src/com/android/settings/spa/app/appcompat/UserAspectRatioAppsPageProviderTest.kt

@@ -67,7 +67,8 @@ class UserAspectRatioAppsPageProviderTest {
     @Test
     fun injectEntry_summary() {
         setInjectEntry()
-        composeTestRule.onNodeWithText(context.getString(R.string.aspect_ratio_summary, Build.MODEL))
+        composeTestRule
+            .onNodeWithText(context.getString(R.string.aspect_ratio_summary, Build.MODEL))
             .assertIsDisplayed()
     }