Fix contributors in release notes.
<release-improvement-list>
<release-item>
+ <release-item-contributor-list>
+ <release-item-contributor id="cynthia.shang"/>
+ <release-item-reviewer id="david.steele"/>
+ </release-item-contributor-list>
+
<p>The <cmd>info</cmd> command is implemented entirely in C.</p>
</release-item>
