[AI Gateway] Fix URL in google-ai-studio.mdx (#18480)

Author: pedrosousa

src/content/docs/ai-gateway/providers/google-ai-studio.mdx

@@ -29,7 +29,7 @@ Your new base URL will use the data above in this structure: `https://gateway.ai
 
 Then you can append the endpoint you want to hit, for example: `v1/models/{model}:{generative_ai_rest_resource}`
 
-So your final URL will come together as: `https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/google-ai-studio/v1//models/{model}:{generative_ai_rest_resource}`.
+So your final URL will come together as: `https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/google-ai-studio/v1/models/{model}:{generative_ai_rest_resource}`.
 
 ## Examples