small bug in sample slrn.rc

Hi.

>From time to time I see slrn users posting with "charset=utf8" in
their charset declaration. Most readers don't have problem with
that, but as far as I know, "utf8" is not a valid charset
declaration and sometimes it leads to problems and discussions.

I noticed, that the sample slrn.rc shipped in the slrn package uses 
"utf8" instead of "utf-8" which might be the cause of these problems.

I think it would be a good idea to change this.

Cheers,

 Thomas

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[X] Nail here for new Monitor

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Index: doc/slrn.rc
===================================================================
--- doc/slrn.rc	(revision 323)
+++ doc/slrn.rc	(working copy)
@@ -180,11 +180,11 @@
 %
 
 % Character set used for the display or terminal; valid values include:
-%   utf8, iso-8859-1, ibm850, ibm852, koi8,
-%charset display utf8
+%   utf-8, iso-8859-1, ibm850, ibm852, koi8,
+%charset display utf-8
 
 % the character set used for outgoing articles
-%charset outgoing "utf8"
+%charset outgoing "utf-8"
 
 % If non-zero, call metamail for MIME formats slrn cannot handle.
 %set use_metamail 1