mandoc: Improve the description of .Fl in multiple respects and in

mandoc: Improve the description of .Fl in multiple respects and in

[schwarze]

Log Message:
-----------
Improve the description of .Fl in multiple respects and in paricular
improve the .Fl examples in multiple respects, including better
demonstrating long options.
Prompted by a question from espie@.
Feedback and OK jmc@.

Modified Files:
--------------
    mandoc:
        mdoc.7

Revision Data
-------------
Index: mdoc.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc.7,v
retrieving revision 1.285
retrieving revision 1.286
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.285 -r1.286
--- mdoc.7
+++ mdoc.7
@@ -1568,19 +1568,25 @@ and
 .It Ic \&Fl Op Ar word ...
 Command-line flag or option.
 Used when listing arguments to command-line utilities.
-Prints a fixed-width hyphen
-.Sq \-
-directly followed by each argument.
-If no arguments are provided, a hyphen is printed followed by a space.
-If the argument is a macro, a hyphen is prefixed to the subsequent macro
-output.
+For each argument, prints an ASCII hyphen-minus character
+.Sq \- ,
+immediately followed by the argument.
+If no arguments are provided, a hyphen-minus is printed followed by a space.
+If the argument is a macro, a hyphen-minus is prefixed
+to the subsequent macro output.
 .Pp
 Examples:
-.Dl ".Fl R Op Fl H | L | P"
-.Dl ".Op Fl 1AaCcdFfgHhikLlmnopqRrSsTtux"
-.Dl ".Fl type Cm d Fl name Pa CVS"
-.Dl ".Fl Ar signal_number"
-.Dl ".Fl o Fl"
+.Dl ".Nm du Op Fl H | L | P"
+.Dl ".Nm ls Op Fl 1AaCcdFfgHhikLlmnopqRrSsTtux"
+.Dl ".Nm route Cm add Fl inet Ar destination gateway"
+.Dl ".Nm locate.updatedb Op Fl \e-fcodes Ns = Ns Ar dbfile"
+.Dl ".Nm aucat Fl o Fl"
+.Dl ".Nm kill Fl Ar signal_number"
+.Pp
+For GNU-sytle long options, escaping the additional hyphen-minus is not
+strictly required, but may be safer with future versions of GNU troff; see
+.Xr mandoc_char 7
+for details.
 .Pp
 See also
 .Ic \&Cm .
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