Improve h4 to h3

Author: Yug2801

fern/docs/pages/plug-sdk/ios.mdx

@@ -109,7 +109,7 @@ DevRev.identifyUnverifiedUser(_:)
 
 The function accepts the `DevRev.Identity` structure, where the user identifier (`userId`) is the only required property; all other properties are optional.
 
-#### Verified identification
+### Verified identification
 The verified identification method is used to identify the user with a unique identifier and verify the user's identity with the DevRev backend.
 
 ```swift
@@ -205,14 +205,14 @@ To display the support chat screen in a SwiftUI app, you can use the following v
 DevRev.supportView
 ```
 
-#### Creating a new conversation
+### Creating a new conversation
 You have the ability to create a new conversation from within your app. The method will show the support chat screen and create a new conversation at the same time.
 
 ```swift
 DevRev.createSupportConversation()
 ```
 
-#### New conversation closure
+### New conversation closure
 
 You can receive a callback when a new conversation is created by setting the following closure: