mandoc: Make it more explicit that the statement "-O tag does not work

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
Make it more explicit that the statement "-O tag does not work with less(1)"
only applies to -T html output mode, and why.  Of course, -O tag works
just fine with less(1) in the -T ascii and -T utf8 output modes.
Potential for confusion pointed out by Ian Ropers.

Modified Files:
--------------
    mandoc:
        mandoc.1

Revision Data
-------------
Index: mandoc.1
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc.1,v
retrieving revision 1.245
retrieving revision 1.246
diff -Lmandoc.1 -Lmandoc.1 -u -p -r1.245 -r1.246
--- mandoc.1
+++ mandoc.1
@@ -423,10 +423,17 @@ MANPAGER='lynx -force_html' man -T html 
 MANPAGER='w3m -T text/html' man -T html -O tag=toc mandoc
 .Ed
 .Pp
-This argument does not work with
+Consequently, for HTML output, this argument does not work with
 .Xr more 1
 or
 .Xr less 1 .
+For example,
+.Ql MANPAGER=less man -T html -O tag=toc mandoc
+does not work because
+.Xr less 1
+does not support
+.Ic file://
+URIs.
 .It Cm toc
 If an input file contains at least two non-standard sections,
 print a table of contents near the beginning of the output.
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