As far as I can understand your question, you should be able to remove the boldface formatting from the RSS item titles by editing the page MediaWiki:Rss-item
(not MediaWiki:Rss-feed
) on your wiki.
What you need to do is two things:
- remove the string
'''
(MediaWiki markup for bold text) from either side of the title, and - remove the
;
(MediaWiki markup for a list definition, which is also bolded by the default style sheet) from the beginning of the line.
That is, change the default content of the page:
; '''<span class='plainlinks'>[{{{link}}} {{{title}}}]</span>'''
: {{{description}}}
: {{{author}}} {{{date}}}<!-- don't use newline here -->
to this:
<span class='plainlinks'>[{{{link}}} {{{title}}}]</span>
: {{{description}}}
: {{{author}}} {{{date}}}<!-- don't use newline here -->