Example typo in homebrew_services.py (#9819)

Maybe this was mixed up with the _brew_service_state() function? I get this error as-written:
```
fatal: [eahmm3]: FAILED! => {"changed": false, "msg": "Unsupported parameters for (community.general.homebrew_services) module: service
_state. Supported parameters include: name, path, state (formula)."}
```

plugins/modules/homebrew_services.py

@@ -72,7 +72,7 @@ EXAMPLES = r"""
 - name: Remove the foo service (equivalent to `brew services stop foo`)
   community.general.homebrew_services:
     name: foo
-    service_state: absent
+    state: absent
 """
 
 RETURN = r"""