update docs

Signed-off-by: Grant Linville <[email protected]>

Author: g-linville

docs/docs/03-tools/03-openapi.md

@@ -18,10 +18,6 @@ List all the pets. After you get a response, create a new pet named Mark. He is
 
 You can also use a local file path instead of a URL.
 
-:::tip
-The file must have extension `.json`, `.yaml`, or `.yml`.
-:::
-
 ## Servers
 
 GPTScript will look at the top-level `servers` array in the file and choose the first HTTPS server it finds.