patch 8.2.4242: put in Visual mode cannot be repeated

Problem:    Put in Visual mode cannot be repeated.
Solution:   Use "P" to put without yanking the deleted text into the unnamed
            register. (Shougo Matsushita, closes #9591)
diff --git a/runtime/doc/visual.txt b/runtime/doc/visual.txt
index 3db506e..d61d5d8 100644
--- a/runtime/doc/visual.txt
+++ b/runtime/doc/visual.txt
@@ -265,6 +265,7 @@
 	X	delete (2)					|v_X|
 	Y	yank (2)					|v_Y|
 	p	put						|v_p|
+	P	put without unnamed register overwrite		|v_P|
 	J	join (1)					|v_J|
 	U	make uppercase					|v_U|
 	u	make lowercase					|v_u|