docs: clarify behavior of launchctl stop and unload for client agent (#5265)

* docs: clarify behavior of launchctl stop and unload for client agent

* docs: update unload command and clarify permanent disabling of Boundary client agent

* docs: remove "Note" wrapper and clarify unload/reload command for Boundary client agent

* docs: Capitalize Client Agent

---------

Co-authored-by: Dan Heath <76443935+Dan-Heath@users.noreply.github.com>

website/content/docs/api-clients/client-agent.mdx

@@ -274,7 +274,13 @@ If you want to disable the Boundary Client Agent, you can stop it with the follo
 <Tab heading="MacOS" group="macos">
 
 ```shell-session
-$ sudo launchctl stop com.hashicorp.boundary.boundary-client-agent
+$ sudo launchctl unload -w /Library/LaunchDaemons/com.hashicorp.boundary.boundary-client-agent.plist
+```
+
+Unloading the Boundary Client Agent removes its launch daemon configuration. To restart the Client Agent, use:
+
+```shell-session
+$ sudo launchctl load -w /Library/LaunchDaemons/com.hashicorp.boundary.boundary-client-agent.plist
 ```
 
 </Tab>