compatibility api clarification (#431)

Author: mrmer1

fern/pages/v2/text-generation/compatibility-api.mdx

@@ -14,6 +14,13 @@ The Compatibility API allows developers to use Cohere’s models through OpenAI
 
 It makes it easy to switch existing OpenAI-based applications to use Cohere’s models while still maintaining the use of OpenAI SDK — no big refactors needed.
 
+The supported libraries are:
+- TypeScript / JavaScript	
+- Python
+- .NET
+- Java (beta)
+- Go (beta)
+
 This is a quickstart guide to help you get started with the Compatibility API.
 
 ## Installation
@@ -835,4 +842,21 @@ The following parameters are not supported in the Compatibility API:
 ### Embeddings
 
 - `dimensions`
-- `user`
+- `user`
+
+### Cohere-specific parameters
+
+Parameters that are uniquely available on the Cohere API but not on the OpenAI SDK are not supported.
+
+Chat endpoint:
+
+- `connectors`
+- `documents`
+- `citation_options`
+- ...[more here](https://docs.cohere.com/reference/chat)
+
+Embed endpoint:
+- `input_type`
+- `images`
+- `truncate`
+- ...[more here](https://docs.cohere.com/reference/embed)