patch 8.2.0074: Python 3 unicode test someitmes fails

Problem:    Python 3 unicode test someitmes fails.
Solution:   Make 'termencoding' empty.  Correct number of error message.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 7d8e032..0fd23a4 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7694,7 +7694,7 @@
 	the GUI it only applies to the keyboard ('encoding' is used for the
 	display).  Except for the Mac when 'macatsui' is off, then
 	'termencoding' should be "macroman".
-								*E617*
+								*E617* *E950*
 	Note: This does not apply to the GTK+ GUI.  After the GUI has been
 	successfully initialized, 'termencoding' is forcibly set to "utf-8".
 	Any attempts to set a different value will be rejected, and an error