docs: Fix up some invalid JSON in OpenAI configuration example (#30663)

Thomas David Baker created

Change summary

docs/src/ai/custom-api-keys.md | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

Detailed changes

docs/src/ai/custom-api-keys.md 🔗 

@@ -207,9 +207,9 @@ The Zed Assistant comes pre-configured to use the latest version for common mode
           "max_tokens": 128000,
           "max_completion_tokens": 20000
         }
-      ]
+      ],
       "version": "1"
-    },
+    }
   }
 }
 ```