Merge pull request #19645 from brnhensley/patch-2

feat: add azure site extention update instructions

src/content/docs/apm/agents/net-agent/installation/update-net-agent.mdx

@@ -70,6 +70,16 @@ Follow the update instructions for your agent:
        * [64-bit installer](https://download.newrelic.com/dot_net_agent/latest_release/NewRelicDotNetAgent_x64.msi)
     4. After the installer package finishes, start IIS.
   </Collapser>
+
+  <Collapser
+    id="site-extention-update"
+    title="Updating the agent with New Relic Azure site extension"
+  >
+    To update the .NET agent for an Azure Web App using the New Relic Azure site extension follow the installation instructions to:
+
+    * Install the latest version of the  New Relic Azure site extension, which updates the agent files to the latest version.
+    * Restart the web app to start the updated agent.
+  </Collapser>
 </CollapserGroup>
 
 ## Update the .NET agent (Linux) [#updating_net_core]