Fix unknown key in keymap.lynx

Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/w3m/+bug/265144
Bug: https://sourceforge.net/p/w3m/bugs/48/

doc-jp/keymap.lynx

@@ -46,7 +46,7 @@ keymap	-	PREV_PAGE
 keymap	.	RIGHT
 keymap	/	SEARCH
 keymap	:	MARK_URL
-keymap	;	MARK_WORD
+keymap	";"	MARK_WORD
 keymap	<	SHIFT_LEFT
 keymap	=	INFO
 keymap	>	SHIFT_RIGHT