patch 8.2.0841: 'verbose' value 16 causes duplicate output

Problem:    'verbose' value 16 causes duplicate output.
Solution:   Combine levels 15 and 16 into one message. (Christian Brabandt,
            closes #6153)
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index cc3f512..a805a0c 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -8331,7 +8331,9 @@
 	>= 12	Every executed function.
 	>= 13	When an exception is thrown, caught, finished, or discarded.
 	>= 14	Anything pending in a ":finally" clause.
-	>= 15	Every executed Ex command (truncated at 200 characters).
+	>= 15	Every executed Ex command from a script (truncated at 200
+		characters).
+	>= 16	Every executed Ex command
 
 	This option can also be set with the "-V" argument.  See |-V|.
 	This option is also set by the |:verbose| command.