Update runtime files
diff --git a/runtime/doc/usr_20.txt b/runtime/doc/usr_20.txt
index ebad3c5..a94195d 100644
--- a/runtime/doc/usr_20.txt
+++ b/runtime/doc/usr_20.txt
@@ -1,4 +1,4 @@
-*usr_20.txt* For Vim version 8.2. Last change: 2006 Apr 24
+*usr_20.txt* For Vim version 8.2. Last change: 2021 Nov 13
VIM USER MANUAL - by Bram Moolenaar
@@ -289,11 +289,11 @@
use the <Up> key to recall an older command line. <Down> then takes you back
to newer commands.
-There are actually four histories. The ones we will mention here are for ":"
+There are actually five histories. The ones we will mention here are for ":"
commands and for "/" and "?" search commands. The "/" and "?" commands share
-the same history, because they are both search commands. The two other
-histories are for expressions and input lines for the input() function.
-|cmdline-history|
+the same history, because they are both search commands. The three other
+histories are for expressions, debug more commands and input lines for the
+input() function. |cmdline-history|
Suppose you have done a ":set" command, typed ten more colon commands and then
want to repeat that ":set" command again. You could press ":" and then ten