Minor tag changes in docbook files.

doc/karbon/index.docbook

@@ -17,7 +17,7 @@
 <title>The &karbon14; Handbook</title>
 
 <authorgroup>
-<corpauthor>&tde-team;</corpauthor>
+<author>&tde-authors;</author>
 <!-- TRANS:ROLES_OF_TRANSLATORS -->
 </authorgroup>