patch 8.2.4881: "P" in Visual mode still changes some registers

Problem:    "P" in Visual mode still changes some registers.
Solution:   Make "P" in Visual mode not change any register. (Shougo
            Matsushita, closes #10349)
diff --git a/runtime/doc/visual.txt b/runtime/doc/visual.txt
index d61d5d8..e9862b1 100644
--- a/runtime/doc/visual.txt
+++ b/runtime/doc/visual.txt
@@ -265,7 +265,7 @@
 	X	delete (2)					|v_X|
 	Y	yank (2)					|v_Y|
 	p	put						|v_p|
-	P	put without unnamed register overwrite		|v_P|
+	P	put without overwriting registers		|v_P|
 	J	join (1)					|v_J|
 	U	make uppercase					|v_U|
 	u	make lowercase					|v_u|