fix admonitions conversion issues (#4765)

Author: Simek

docs/appearance.md

@@ -77,7 +77,7 @@ Supported color schemes:
 
 See also: `useColorScheme` hook.
 
-::note
+:::note
 `getColorScheme()` will always return `light` when debugging with Chrome.
 :::
 

docs/get-started-without-a-framework.md

@@ -99,9 +99,9 @@ If everything is set up correctly, you should see your new app running in your A
 
 This is one way to run your app - you can also run it directly from within Android Studio.
 
-::tip
+:::tip
 If you can't get this to work, see the [Troubleshooting](troubleshooting.md) page.
-::
+:::
 
 ### Step 4: Modifying your app