docs(snix/castore/path): fix docstring

This returns as a [PathComponent], not as bytes.

Change-Id: Ia6df19be6f3060b28f8be6b74f3f3f443a536f8a
Reviewed-on: https://cl.snix.dev/c/snix/+/30327
Autosubmit: Florian Klink <flokli@flokli.de>
Reviewed-by: Domen Kožar <domen@cachix.org>
Tested-by: besadii

snix/castore/src/path/mod.rs

@@ -112,7 +112,8 @@ impl Path {
         iter
     }
 
-    /// Returns the final component of the Path, if there is one, in bytes.
+    /// Returns the final component of the Path, if there is one, as a
+    /// [PathComponent].
     pub fn file_name(&self) -> Option<PathComponent> {
         self.components().last()
     }