docs: simplify update examples to single comprehensive example

Consolidated three separate update examples into one that shows all parameters together. Makes the documentation more concise while still covering all update scenarios.

Author: Kunal1522

docs/versioned/eventing/channels/subscriptions.md

@@ -180,35 +180,20 @@ You can update an existing Subscription by using the `kn` CLI tool or by applyin
 === "kn"
     Use the `kn subscription update` command to modify an existing Subscription.
 
-    **Example 1: Update the Sink of a Subscription**
-
-    To change the Subscriber (Sink) of an existing Subscription named `mysubscription` to a different Knative Service:
-
-    ```bash
-    kn subscription update mysubscription \
-      --sink ksvc:new-service
-    ```
-
-    **Example 2: Add a Dead Letter Sink**
-
-    To add or update the dead letter sink for event delivery failures:
-
-    ```bash
-    kn subscription update mysubscription \
-      --sink ksvc:myservice \
-      --sink-dead-letter ksvc:error-handler
-    ```
-
-    **Example 3: Update the Reply Sink**
-
-    To change where reply events are sent:
+    **Example:**
 
     ```bash
     kn subscription update mysubscription \
       --sink ksvc:myservice \
+      --sink-dead-letter ksvc:error-handler \
       --sink-reply channel:reply-channel
     ```
 
+    You can update individual parameters as needed:
+    - `--sink`: Change the subscriber (destination for events)
+    - `--sink-dead-letter`: Add or update the dead letter sink for failed deliveries
+    - `--sink-reply`: Update where reply events are sent
+
     !!! note
         When updating a Subscription, you must provide all the configuration parameters you want to keep. Any parameters not specified in the update command will use default values.