style: fix docs and dead code lint (#1340)

* style: fix docs and dead code lint

* style: feature flag dead code lint to v1 api for thumbnail from path

Author: ok-nick

sdk/src/ingredient.rs

@@ -1429,7 +1429,7 @@ impl Ingredient {
 
     /// Automatically generate a thumbnail for the ingredient if missing and enabled in settings.
     ///
-    /// This function takes into account the [Settings][crate::Settings]:
+    /// This function takes into account the [Settings][crate::settings::Settings]:
     /// * `builder.thumbnail.enabled`
     #[cfg(feature = "add_thumbnails")]
     pub fn maybe_add_thumbnail<R>(&mut self, format: &str, stream: &mut R) -> Result<()>

sdk/src/utils/thumbnail.rs

@@ -99,6 +99,7 @@ impl fmt::Display for ThumbnailFormat {
 /// * `builder.thumbnail.ignore_errors`
 ///
 /// Read [make_thumbnail_from_stream] for more information.
+#[cfg_attr(feature = "v1_api", allow(dead_code))]
 #[cfg(feature = "file_io")]
 pub fn make_thumbnail_bytes_from_path(
     path: &std::path::Path,