Update doc

nnn.1

@@ -199,7 +199,7 @@ when dealing with the !, e and p commands respectively. A single combination to
     export NNN_TRASH=1
 .Ed
 .Pp
-\fBNN:\fR this is a special variable set to the current entry before executing a command from the command prompt or spawning a shell.
+\fBNNN:\fR this is a special variable set to the current entry before executing a command from the command prompt or spawning a shell.
 .Sh KNOWN ISSUES
 .Nm
 may not handle keypresses correctly when used with tmux (see issue #104 for more details). Set \fBTERM=xterm-256color\fR to address it.