Remove doc(hidden) attribute that is being phased out

    warning: `#[doc(hidden)]` is ignored on trait impl items
        --> src/parse.rs:1220:5
         |
    1220 |     #[doc(hidden)]
         |     ^^^^^^^^^^^^^^ help: remove this attribute
         |
         = note: `#[warn(unused_attributes)]` on by default
         = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
         = note: whether the impl item is `doc(hidden)` or not entirely depends on the corresponding trait item

    warning: `#[doc(hidden)]` is ignored on trait impl items
        --> src/parse.rs:1236:5
         |
    1236 |     #[doc(hidden)]
         |     ^^^^^^^^^^^^^^ help: remove this attribute
         |
         = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
         = note: whether the impl item is `doc(hidden)` or not entirely depends on the corresponding trait item

src/parse.rs

@@ -1217,7 +1217,6 @@ where
         }
     }
 
-    #[doc(hidden)]
     #[cfg(any(feature = "full", feature = "derive"))]
     fn __parse_scoped(self, scope: Span, tokens: TokenStream) -> Result<Self::Output> {
         let buf = TokenBuffer::new2(tokens);
@@ -1233,7 +1232,6 @@ where
         }
     }
 
-    #[doc(hidden)]
     #[cfg(any(feature = "full", feature = "derive"))]
     fn __parse_stream(self, input: ParseStream) -> Result<Self::Output> {
         self(input)