nxagent.1: fix indentation

Author: uli42

nx-X11/programs/Xserver/hw/nxagent/man/nxagent.1

@@ -554,6 +554,7 @@ format must be included in both. This is potentially unsafe.
 .I bypass
 means that all of these checks are essentially
 deactivated. This is a very bad idea.
+.RE
 .TP 8
 .B autograb=<int>
 enable or disable autograb (default: disabled)