Doc: stream feature is needed for wrap_stream and From<File> for Body (#1456)

At least `wrap_stream` it is written in plain text, but adding the visual flag should be better and coherent with `byte_stream` documentation, but nothing is shown for `From<File>` for `Body`.

Co-authored-by: kraktus <kraktus@users.noreply.github.com>

src/async_impl/body.rs

@@ -79,6 +79,7 @@ impl Body {
     ///
     /// This requires the `stream` feature to be enabled.
     #[cfg(feature = "stream")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "stream")))]
     pub fn wrap_stream<S>(stream: S) -> Body
     where
         S: futures_core::stream::TryStream + Send + Sync + 'static,
@@ -213,6 +214,7 @@ impl From<&'static str> for Body {
 }
 
 #[cfg(feature = "stream")]
+#[cfg_attr(docsrs, doc(cfg(feature = "stream")))]
 impl From<File> for Body {
     #[inline]
     fn from(file: File) -> Body {