Update json-endpoint.mdx

update `json_schema` to `schema`

Author: kathayl

src/content/docs/browser-rendering/rest-api/json-endpoint.mdx

@@ -34,7 +34,7 @@ curl --request POST 'https://api.cloudflare.com/client/v4/accounts/CF_ACCOUNT_ID
   "prompt": "Get me the list of AI products",
   "response_format": {
     "type": "json_schema",
-    "json_schema": {
+    "schema": {
         "type": "object",
         "properties": {
           "products": {
@@ -130,7 +130,7 @@ curl --request POST 'https://api.cloudflare.com/client/v4/accounts/CF_ACCOUNT_ID
   --header 'content-type: application/json' \
   --data '"response_format": {
     "type": "json_schema",
-    "json_schema": {
+    "schema": {
         "type": "object",
         "properties": {
           "products": {
@@ -293,7 +293,7 @@ curl --request POST \
   "prompt": "Get the heading from the page in the form of an object like h1, h2. If there are many headings of the same kind then grab the first one.",
   "response_format": {
     "type": "json_schema",
-    "json_schema": {
+    "schema": {
       "type": "object",
       "properties": {
         "h1": {