fix: remove duplicate doc comments in byot macro output (#501)

The byot macro was generating duplicate attributes (including doc comments)
because it added #(#attrs)* before #input, but #input already contains all
its attributes. This caused doc strings like "Retrieves an assistant." to
appear twice as "Retrieves an assistant. Retrieves an assistant."

Fixes #345

Author: majiayu000

async-openai-macros/src/lib.rs

@@ -130,7 +130,6 @@ pub fn byot(args: TokenStream, item: TokenStream) -> TokenStream {
     };
 
     let expanded = quote! {
-        #(#attrs)*
         #input
 
         #(#attrs)*