Update openrouter.mdx

Clarify that OpenRouter URL and app name are optional, and just for OpenRouter to track the most popular apps, and you can choose whatever you want here (but Open Interpreter is the most obvious choice)

Author: endolith

docs/language-models/hosted-models/openrouter.mdx

@@ -55,10 +55,10 @@ interpreter.llm.model = "openrouter/meta-llama/llama-2-70b-chat"
 
 # Required Environment Variables
 
-Set the following environment variables [(click here to learn how)](https://chat.openai.com/share/1062cdd8-62a1-4aa8-8ec9-eca45645971a) to use these models.
+Set the following LiteLLM environment variables [(click here to learn how)](https://chat.openai.com/share/1062cdd8-62a1-4aa8-8ec9-eca45645971a) to use these models.
 
 | Environment Variable  | Description  | Where to Find  |
 | --------------------- | ------------ | -------------- |
 | `OPENROUTER_API_KEY`       | The API key for authenticating to OpenRouter's services. | [OpenRouter Account Page](https://openrouter.ai/keys) |
-| `OR_SITE_URL`      | The site URL for OpenRouter's services. | [OpenRouter Account Page](https://openrouter.ai/keys) |
-| `OR_APP_NAME`   | The app name for OpenRouter's services. | [OpenRouter Account Page](https://openrouter.ai/keys) |
+| `OR_SITE_URL`      | An optional app URL for tracking usage, such as `https://github.com/openinterpreter/open-interpreter/`. | Your choice |
+| `OR_APP_NAME`   | An optional app name for tracking usage, such as `"Open Interpreter"`. | Your choice |