[wwwdocs] Make plain text requirement more descriptive

[Jonathan Wakely]

I noticed a missing space between a comma and ellipsis, but expanding
the ellipsis seems more helpful anyway.

OK for wwwdocs?


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commit d06fcccabee91cfd17d01b379ea5400fd787b6f3
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Jun 15 10:17:03 2020 +0100

    Make plain text requirement more descriptive

diff --git a/htdocs/lists.html b/htdocs/lists.html
index ea37aedc..b0c2248d 100644
--- a/htdocs/lists.html
+++ b/htdocs/lists.html
@@ -166,7 +166,8 @@ this size, you should compress any attachments before sending it to the list.
 <p>When posting messages, please select an appropriate list for the message
 and try to avoid cross posting to several lists.</p>
 
-<p>Please send plain text (as opposed to HTML, RTF,...).</p>
+<p>Please send plain text
+(as opposed to HTML, RTF, or other types with fancy formatting).</p>
 
 <p id="confidential">Do not include or reference confidentiality
 notices, like:</p>