docs(input.md): add docs on 'get_supported_openai_params'

docs/my-website/docs/completion/input.md

@@ -24,6 +24,17 @@ print(response)
 ```
 
 ### Translated OpenAI params
+
+Use this function to get an up-to-date list of supported openai params for any model + provider. 
+
+```python
+from litellm import get_supported_openai_params
+
+response = get_supported_openai_params(model="anthropic.claude-3", custom_llm_provider="bedrock")
+
+print(response) # ["max_tokens", "tools", "tool_choice", "stream"]
+```
+
 This is a list of openai params we translate across providers.
 
 This list is constantly being updated.