Fix TEXI section mark imbalance in qemu-img-cmd.hx

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index c079019..c4cf3e7 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -7,7 +7,7 @@
 
 STEXI
 @table @option
-STEXI
+ETEXI
 
 DEF("check", img_check,
     "check [-f fmt] filename")