* overview.xml: Changed root node tag name in DOCTYPE declaration.
* plugin-runner.xml (/refentry): Add XInclude namespace. (/refentry/refentryinfo/legalnotice): Replaced with an inclusion of "legalnotice.xml".
* plugins.d/password-prompt.xml (/refentry): Add XInclude namespace. (/refentry/refentryinfo/legalnotice): Replaced with an inclusion of "legalnotice.xml".
* plugins.d/password-request.xml (/refentry): Add XInclude namespace. (/refentry/refentryinfo/legalnotice): Replaced with an inclusion of "legalnotice.xml".