docs: Make update-stream use curl example system.

new_name and description params should be valid JSON
strings. The format of these params are marked as
json so that the curl example genenrator can convert
them into json strings.

templates/zerver/api/update-stream.md

@@ -20,13 +20,7 @@ including:
 
 {tab|curl}
 
-``` curl
+{generate_code_example(curl, include=["new_name", "description", "is_private"])|/streams/{stream_id}:patch|example}
-curl -X PATCH {{ api_url }}/v1/streams/{stream_id} \
-    -u BOT_EMAIL_ADDRESS:BOT_API_KEY \
-    -d 'new_name="Manchester United"' \
-    -d 'description="Biggest club in the world"' \
-    -d 'is_private=false'
-```
 
 {end_tabs}
 

zerver/lib/bugdown/api_code_examples.py

@@ -140,6 +140,8 @@ cURL example.""".format(endpoint, method, param_name)
         example_value = param.get("example", DEFAULT_EXAMPLE[param["schema"]["type"]])
         if type(example_value) == bool:
             example_value = str(example_value).lower()
+        if param["schema"].get("format", "") == "json":
+            example_value = json.dumps(example_value)
         if curl_argument:
             return "    -d '{}={}'".format(param_name, example_value)
         return example_value

zerver/openapi/test_curl_examples.py

@@ -30,6 +30,7 @@ exclude_list = [
     'add-linkifiers.md',
     'get-events-from-queue.md',
     'delete-queue.md',
+    'update-stream.md',
     # Endpoint can be called only by administrators.
     'create-user.md',
     'remove-linkifiers.md',

zerver/openapi/zulip.yaml

@@ -2502,6 +2502,7 @@ paths:
         description: The new description for the stream.
         schema:
           type: string
+          format: json
         example: "This stream is related to football dicsussions."
         required: false
       - name: new_name
@@ -2509,6 +2510,7 @@ paths:
         description: The new name for the stream.
         schema:
           type: string
+          format: json
         example: "Italy"
         required: false
       - name: is_private