Fix encode/decode method doc of str, bytes, bytearray types

 * Specify the default encoding: write 'utf-8' instead of
   sys.getdefaultencoding(), because the default encoding is now constant
 * Specify the default errors value
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 32bcb34..4be0b17 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -7393,10 +7393,10 @@
 }
 
 PyDoc_STRVAR(encode__doc__,
-             "S.encode([encoding[, errors]]) -> bytes\n\
+             "S.encode([encoding='utf-8'[, errors='strict']]) -> bytes\n\
 \n\
-Encode S using the codec registered for encoding. encoding defaults\n\
-to the default encoding. errors may be given to set a different error\n\
+Encode S using the codec registered for encoding. Default encoding\n\
+is 'utf-8'. errors may be given to set a different error\n\
 handling scheme. Default is 'strict' meaning that encoding errors raise\n\
 a UnicodeEncodeError. Other possible values are 'ignore', 'replace' and\n\
 'xmlcharrefreplace' as well as any other name registered with\n\