I believe that the below little patch should fix it.
From 949e2633f27ace47d6774e370207bc6e58a031ab Mon Sep 17 00:00:00 2001
Date: Mon, 5 Oct 2015 16:14:42 -0400
Subject: [PATCH] Remove extra trailing double quote (bug # 21622)
---
src/buffer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/buffer.c b/src/buffer.c
index 530fe11..38ee74d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -6238,7 +6238,7 @@ If nil, only shows a cursor in the selected window.
If t, displays a cursor related to the usual cursor type
(a solid box becomes hollow, a bar becomes a narrower bar).
You can also specify the cursor type as in the `cursor-type' variable.
-Use Custom to set this variable and update the display." */);
+Use Custom to set this variable and update the display. */);
DEFVAR_LISP ("kill-buffer-query-functions", Vkill_buffer_query_functions,
doc: /* List of functions called with no args to query before killing a buffer.
--
2.6.0.rc0.24.gec371ff