winedbg: Properly end non-formatted text in man page.

The .nf macro stops formatting of the text in the man page, and the
macro .fi should be used to end.  This wasn't done before, which is
noticable for where the text is wrapped when opening the man page with a
larger/smaller terminal width.

programs/winedbg/winedbg.man.in

@@ -33,11 +33,11 @@ winedbg \- Wine's debugger
 .B winedbg
 is a debugger for Wine. It allows:
 .RS 4
+.nf
 + debugging native Win32 applications
-.nf
 + debugging Winelib applications.
-.nf
 + being a drop-in replacement for Dr Watson
+.fi
 .RE
 .PP
 
@@ -243,12 +243,10 @@ Lists 10 source lines from address \fBN\fR
 .PP
 You can specify the end target (to change the 10 lines value) using
 the ',' separator. For example:
-.nf
 .IP \fBlist\ 123,\ 234\fR
 lists source lines from line 123 up to line 234 in current file
-.nf
 .IP \fBlist\ foo.c:1,56\fR
-lists source lines from line 1 up to 56 in file foo.c 
+lists source lines from line 1 up to 56 in file foo.c
 .PP
 \fIDisplaying\fR
 .PP