breaks on cdata on comments

the report is broken by cdata sections in comments: the end cdata sequence ]]> should be escaped/removed bfore writing the xml report:

BUILD FAILED
File...... file:/D:/programmi/maven/plugins/maven-xdoc-plugin-1.6-SNAPSHOT/
Element... x:parse
Line...... 98
Column.... 46
Error on line 134 of document file:/D:/apps/plugins/maven-xhtml-plugin/target/changelog.xml : The character sequence "]]>" must not appear i
n content unless used to mark the end of a CDATA section. Nested exception: The character sequence "]]>" must not appear in content unless u
sed to mark the end of a CDATA section.

The attached patch fixes it replacing ]]> in comments