patch 8.2.4846: termcodes test fails

Problem:    Termcodes test fails.
Solution:   use CTRL-SHIFT-V to insert an unsimplified key. (closes #10316)
diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index 2ef09fa..8b49134 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -87,6 +87,7 @@
 CTRL-SHIFT-V				*c_CTRL-SHIFT-V* *c_CTRL-SHIFT-Q*
 CTRL-SHIFT-Q	Works just like CTRL-V, unless |modifyOtherKeys| is active,
 		then it inserts the Escape sequence for a key with modifiers.
+		In the GUI the |key-notation| is inserted without simplifying.
 
 							*c_<Left>* *c_Left*
 <Left>		cursor left