Revert copy_reg -> copyreg rename.
diff --git a/Misc/cheatsheet b/Misc/cheatsheet
index 1ce1996..e699359 100644
--- a/Misc/cheatsheet
+++ b/Misc/cheatsheet
@@ -1864,7 +1864,7 @@
compileall Force "compilation" of all .py files in a directory.
configparser Configuration file parser (much like windows .ini files)
copy Generic shallow and deep copying operations.
-copyreg Helper to provide extensibility for pickle/cPickle.
+copy_reg Helper to provide extensibility for pickle/cPickle.
csv Read and write files with comma separated values.
dbhash (g)dbm-compatible interface to bsdhash.hashopen.
dircache Sorted list of files in a dir, using a cache.