docs: Make get-presence use curl example system.

templates/zerver/api/get-presence.md

@@ -23,10 +23,7 @@ for details on the data model for presence in Zulip.
 
 {tab|curl}
 
-``` curl
-curl -X GET {{ api_url }}/v1/users/{email}/presence \
-    -u BOT_EMAIL_ADDRESS:BOT_API_KEY
-```
+{generate_code_example(curl)|/users/{email}/presence:get|example}
 
 {end_tabs}
 

zerver/openapi/test_curl_examples.py

@@ -23,6 +23,7 @@ exclude_list = [
     'remove-subscriptions.md',
     'get-stream-topics.md',
     'delete-stream.md',
+    'get-presence.md',
     # Endpoint can be called only by administrators.
     'create-user.md',
 ]