Update universal.mdx

Author: kathayl

src/content/docs/ai-gateway/providers/universal.mdx

@@ -20,7 +20,7 @@ AI Gateway offers multiple endpoints for each Gateway you create - one endpoint
 
 You can use the Universal endpoint to contact every provider. The payload is expecting an array of message, and each message is an object with the following parameters:
 
-- `provider` : the name of the provider you would like to direct this message to. Can be OpenAI, workers-ai, or any of our supported providers.
+- `provider` : the name of the provider you would like to direct this message to. Can be OpenAI, Workers AI, or any of our supported providers.
 - `endpoint`: the pathname of the provider API you’re trying to reach. For example, on OpenAI it can be `chat/completions`, and for Workers AI this might be [`@cf/meta/llama-3.1-8b-instruct`](/workers-ai/models/llama-3.1-8b-instruct/). See more in the sections that are specific to [each provider](/ai-gateway/providers/).
 - `headers`:
   - `Authorization`: the content of the Authorization HTTP Header that should be used when contacting this provider. This usually starts with "Token" or "Bearer".