Use sentence case heading

Author: dhananjayj-dev

fern/docs/pages/sdks/mobile/android/features.mdx

@@ -630,7 +630,7 @@ For example:
 <input type="text" placeholder="Enter Username" name="username" required class="devrev-unmask">
 ```
 
-### Custom Masking Provider
+### Custom masking provider
 
 For advanced use cases, you can provide a custom masking provider to explicitly specify which regions of the UI should be masked during snapshots.