.Bd directive has no matching .Ed

Add .Ed to match with .Bd

nnn.1

@@ -142,6 +142,7 @@ type. Custom associations are listed in the EXAMPLES section below.
 
         echo -n $1 | xsel --clipboard --input
         -------------------------------------
+.Ed
 .Sh EXAMPLES
 The following example shows one possible configuration for
 file associations which is also the default if environment