Updated shutil.Error docstring as per feedback

Author: Lakshya-Upadhyaya

Doc/library/shutil.rst

@@ -515,9 +515,9 @@ Directory and files operations
 
 .. exception:: Error
 
-   This exception collects exceptions that are raised during a multi-file
+   Subclass of :exc:`OSError` collecting exceptions raised during a multi-file
    operation. For :func:`copytree`, the exception argument is a list of 3-tuples
-   (*srcname*, *dstname*, *exception*). :exc:`!Error` is a subclass of :exc:`OSError`.
+   (*srcname*, *dstname*, *exception*).
 
 .. _shutil-platform-dependent-efficient-copy-operations: