chore: fix heading order caused accessibility check failures

Author: HuiSF

src/fragments/lib/storage/android/download.mdx

@@ -2,7 +2,7 @@
 
 {/* TODO Rewrite monitor progress of download for iOS/Flutter/Android? */}
 
-#### With StoragePath
+### With StoragePath
 
 <BlockSwitcher>
 <Block name="Java">
@@ -130,7 +130,7 @@ download
 
 To track progress of the download, use the `downloadFile` API that includes a progress listener callback.
 
-#### With StoragePath
+### With StoragePath
 
 <BlockSwitcher>
 <Block name="Java">
@@ -268,7 +268,7 @@ download
 
 You can also retrieve a URL for the object in storage:
 
-#### With StoragePath
+### With StoragePath
 
 <BlockSwitcher>
 <Block name="Java">

src/fragments/lib/storage/ios/download.mdx

@@ -4,7 +4,7 @@ There are three ways of getting data that was previously uploaded:
 
 You can download to in-memory buffer [Data](https://developer.apple.com/documentation/foundation/data) object with `Amplify.Storage.downloadData`:
 
-#### With StoragePath
+### With StoragePath
 <BlockSwitcher>
 
 <Block name="Async/Await">
@@ -48,7 +48,7 @@ let resultSink = downloadTask
 
 </BlockSwitcher>
 
-#### With Key (Deprecated)
+### With Key (Deprecated)
 <BlockSwitcher>
 
 <Block name="Async/Await">
@@ -96,7 +96,7 @@ let resultSink = downloadTask
 
 You can download to a file [URL](https://developer.apple.com/documentation/foundation/url) with `Amplify.Storage.downloadFile`:
 
-#### With StoragePath
+### With StoragePath
 <BlockSwitcher>
 
 <Block name="Async/Await">
@@ -158,7 +158,7 @@ let resultSink = downloadTask
 
 </BlockSwitcher>
 
-#### With Key (Deprecated)
+### With Key (Deprecated)
 <BlockSwitcher>
 
 <Block name="Async/Await">
@@ -296,4 +296,4 @@ downloadTask.resume()
 
 Download tasks are run using `URLSessionTask` instances internally. You can learn more about them in [Apple's official documentation](https://developer.apple.com/documentation/foundation/urlsessiontask).
 
-</Callout>
+</Callout>