update docs

openapi.yaml

@@ -2508,7 +2508,10 @@ components:
  type: string
  description: &completion_finish_reason_description |
  The reason the model stopped generating tokens. This will be `stop` if the model hit a natural stop point or a provided stop sequence,
- or `length` if the maximum number of tokens specified in the request was reached.
+ `length` if the maximum number of tokens specified in the request was reached,
+ `content_filter` if content was omitted due to a flag from our content filters,
+ or `function_call` if the model decided to call a function.
+
  enum: ["stop", "length", "content_filter", "function_call"]
  usage:
  $ref: "#/components/schemas/CompletionUsage"