Move contributor list to the end of release.xml for convenience.
-<!ELEMENT doc ((description, intro, contributor-list, release-list)|(config, operation)|
+<!ELEMENT doc ((description, intro, release-list, contributor-list)|(config, operation)|
(description?, variable-list?, block-define*, cleanup?, section+))>
<!ATTLIST doc title CDATA #REQUIRED>
<!ATTLIST doc subtitle CDATA "">
