Update src/stream/stream/partial_cmp.rs

Hides docs as standard in our codebase for all Future types

Co-Authored-By: Fedor Sakharov <fedor.sakharov@gmail.com>

Author: assemblaj

src/stream/stream/partial_cmp.rs

@@ -89,4 +89,4 @@ where
             }
         }
     }
-}
+}