Okay .. I’m using Notepad++ for the line numbers.
Line 31
<p><?php _e("The <acronym title=\"Uniform Resource Identifier\">URI</acronym> to TrackBack this entry is:"); ?> <em><?php trackback_url() ?></em></p>
That’s your first request. You might just want to make it less intrusive though, so try replacing it with this ? :
<p><a href="<?php trackback_url() ?>" rel="trackback"><?php _e('TrackBack <abbr title="Uniform Resource Identifier">URI</abbr>'); ?></a></p>
Second part:
Line 51
<p><?php _e("Line and paragraph breaks automatic, e-mail address never displayed, <acronym title=\"Hypertext Markup Language\">HTML</acronym> allowed:"); ?> <code><?php echo allowed_tags(); ?></code></p>
All those tags are produced by the last tag there
<code><?php echo allowed_tags(); ?></code>
And Notepad++ is an excellent little text editor for this sort of job:
https://notepad-plus.sourceforge.net/uk/site.htm