fixed typo -- thanks Nick

Doc/library/shutil.rst

@@ -103,7 +103,7 @@ Directory and files operations
    exist, a exception will be added in the list of errors raised in
    a :exc:`Error` exception at the end of the copy process.
    You can set the optional *ignore_dangling_symlinks* flag to true if you
-   want to silent this exception.
+   want to silence this exception.
 
    If *ignore* is given, it must be a callable that will receive as its
    arguments the directory being visited by :func:`copytree`, and a list of its

Lib/shutil.py

@@ -162,7 +162,7 @@ def copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2,
     an Error exception at the end of the copy process.
 
     You can set the optional ignore_dangling_symlinks flag to true if you
-    want to silent this exception.
+    want to silence this exception.
 
 
     The optional ignore argument is a callable. If given, it