Update costs.mdx (#16694)

-remove Workers AI from supported providers bc not yet supported. We can re-add in once we support it
-form link was incorrect, updated

Author: kathayl

src/content/docs/ai-gateway/observability/costs.mdx

@@ -16,7 +16,6 @@ AI Gateway currently supports cost metrics from the following providers:
 - OpenAI
 - Perplexity
 - Replicate
-- Workers AI
 
 Cost metrics are only available for endpoints where the models return token data and the model name in their responses.
 
@@ -28,7 +27,7 @@ The cost metric is an **estimation** based on the number of tokens sent and rece
 
 :::caution[Caution]
 
-Providers may introduce new models or change their pricing. If you notice outdated cost data or are using a model not yet supported by our cost tracking, please [submit a request](https://forms.gle/cuXu1QnQCrSNkkaS8)
+Providers may introduce new models or change their pricing. If you notice outdated cost data or are using a model not yet supported by our cost tracking, please [submit a request](https://forms.gle/8kRa73wRnvq7bxL48)
 
 :::