patch 8.1.2231: not easy to move to the middle of a text line

Problem:    Not easy to move to the middle of a text line.
Solution:   Add the gM command. (Yasuhiro Matsumoto, closes #2070)
diff --git a/runtime/doc/usr_25.txt b/runtime/doc/usr_25.txt
index 7f65a85..1f71f3e 100644
--- a/runtime/doc/usr_25.txt
+++ b/runtime/doc/usr_25.txt
@@ -346,12 +346,13 @@
 
 	g0		to first visible character in this line
 	g^		to first non-blank visible character in this line
-	gm		to middle of this line
+	gm		to middle of screen line
+	gM		to middle of the text in this line
 	g$		to last visible character in this line
 
-		|<--	 window    -->|
-	some long    text, part of which is visible ~
-		 g0  g^    gm	     g$
+		|<--	  window     -->|
+	some long    text, part of which is visible in one line ~
+		 g0  g^    gm	   gM g$
 
 
 BREAKING AT WORDS				*edit-no-break*