Add swift code examples.

src/pages/docs/messages/updates-deletes.mdx

@@ -88,6 +88,40 @@ await channel.updateMessage(
   { description: 'reason for update' }
 );
 ```
+
+```swift
+import Ably
+
+let realtime = ARTRealtime(key: "{{API_KEY}}")
+// This assumes there is an 'updates' namespace with a channel rule enabling updates and deletes
+let channel = realtime.channels.get("updates:example")
+
+// Publish the original message
+channel.publish([.init(name: "message-name", data: "original-data")]) { result, error in
+    if let error = error {
+        print("Failed to publish: \(error.message)")
+        return
+    }
+
+    // Get the serial from the published message
+    guard let serial = result.serials.first else {
+        print("No serial available")
+        return
+    }
+
+    // Publish an update using the serial
+    let messageUpdate = ARTMessage(name: nil, data: "updated-data")
+    messageUpdate.serial = serial
+
+    channel.update(messageUpdate, operation: .init(clientId: nil, descriptionText: "reason for update", metadata: nil), params: nil) { result, error in
+        if let error = error {
+            print("Failed to update message: \(error.message)")
+            return
+        }
+        print("Message updated")
+    }
+}
+```
 </Code>
 
 #### Returns
@@ -182,6 +216,40 @@ await channel.deleteMessage(
   { description: 'reason for delete' }
 );
 ```
+
+```swift
+import Ably
+
+let realtime = ARTRealtime(key: "{{API_KEY}}")
+// This assumes there is an 'updates' namespace with a channel rule enabling updates and deletes
+let channel = realtime.channels.get("updates:example")
+
+// Publish the original message
+channel.publish([.init(name: "message-name", data: "original-data")]) { result, error in
+    if let error = error {
+        print("Failed to publish: \(error.message)")
+        return
+    }
+
+    // Get the serial from the published message
+    guard let serial = result.serials.first else {
+        print("No serial available")
+        return
+    }
+
+    // Delete the message using the serial
+    let messageToDelete = ARTMessage(name: nil, data: "") // clear the previous data
+    messageToDelete.serial = serial
+
+    channel.delete(messageToDelete, operation: .init(clientId: nil, descriptionText: "reason for delete", metadata: nil), params: nil) { result, error in
+        if let error = error {
+            print("Failed to delete message: \(error.message)")
+            return
+        }
+        print("Message deleted")
+    }
+}
+```
 </Code>
 
 #### Returns
@@ -279,6 +347,43 @@ channel.appendMessage({ serial, data: '!' });
 
 // the message in history now has data: "Hello, World!"
 ```
+
+```swift
+import Ably
+
+let realtime = ARTRealtime(key: "{{API_KEY}}")
+// This assumes there is an 'updates' namespace with a channel rule enabling updates and deletes
+let channel = realtime.channels.get("updates:example")
+
+// Publish the original message
+channel.publish([.init(name: "message-name", data: "Hello")]) { result, error in
+    if let error = error {
+        print("Failed to publish: \(error.message)")
+        return
+    }
+
+    // Get the serial from the published message
+    guard let serial = result.serials.first else {
+        print("No serial available")
+        return
+    }
+
+    // Append to the message a few times (without needing to await each to finish
+    // before doing the next); the data will be concatenated
+    for fragment in [", ", "World", "!"] { // fragments to append
+        let messageAppend = ARTMessage(name: nil, data: fragment)
+        messageAppend.serial = serial
+
+        channel.append(messageAppend, operation: nil, params: nil) { result, error in
+            if let error = error {
+                print("Failed to append: \(error.message)")
+                return
+            }
+            print("Message appended with fragment: \(fragment)")
+        }
+    }
+}
+```
 </Code>
 
 #### Returns
@@ -342,6 +447,25 @@ const channel = rest.channels.get('updates:example');
 // message for a serial you have stored or passed around
 const message = await channel.getMessage(msg);
 ```
+
+```swift
+import Ably
+
+let rest = ARTRest(key: "{{API_KEY}}")
+let channel = rest.channels.get("updates:example")
+
+let serial = "0123456789-001@abcdefghij:001" // example serial
+
+channel.getMessageWithSerial(serial) { message, error in
+    if let error = error {
+        print("Failed to get message: \(error.message)")
+        return
+    }
+    if let message = message {
+        print("Retrieved message: \(message.data, default: "")")
+    }
+}
+```
 </Code>
 
 ## Get message versions <a id="versions"/>
@@ -366,6 +490,25 @@ const channel = rest.channels.get('updates:example');
 const page = await channel.getMessageVersions(msg);
 console.log(`Found ${page.items.length} versions`);
 ```
+
+```swift
+import Ably
+
+let rest = ARTRest(key: "{{API_KEY}}")
+let channel = rest.channels.get("updates:example")
+
+let serial = "0123456789-001@abcdefghij:001" // example serial
+
+channel.getMessageVersions(withSerial: serial) { page, error in
+    if let error = error {
+        print("Failed to get message versions: \(error.message)")
+        return
+    }
+    if let page = page {
+        print("Found \(page.items.count) versions")
+    }
+}
+```
 </Code>
 
 ## Message version structure <a id="version-structure"/>