Drop references to removed documents in metadoc.xml

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Hi,

The following documents no longer exists in the docs tree, so they should
be removed from /doc/en/metadoc.xml=20

/proj/en/infrastructure/tenshi/index.xml
/proj/es/infrastructure/faq.xml
/proj/en/infrastructure/mirrors-rsync.xml
/proj/en/base/embedded/gnap-userguide.xml

Regards.

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