Fix typo in shutil.rst documentation

Author: NewUserHa

Doc/library/shutil.rst

@@ -541,7 +541,7 @@ On Solaris :func:`os.sendfile` is used.
 On Windows :func:`shutil.copyfile` uses a bigger default buffer size (1 MiB
 instead of 64 KiB) and a :func:`memoryview`-based variant of
 :func:`shutil.copyfileobj` is used, which is still read and write in a loop.
-:func:`shutil.copy2` uses native call `CopyFile2` on windows and it is the most 
+:func:`shutil.copy2` uses native call `CopyFile2` on windows and it is the most
 efficient and support copy-on-write, but preserve the metadata.
 
 If the fast-copy operation fails and no data was written in the destination