Another typo

If no objections are raised until tomorrow noon, then I will also correct the 
following typos:

In section 3.2, the text mentions "meta:type" but the RelaxNG schema
says "meta:value-type". The text mist mention "meta:value-type", too.

The same applies to the example in "2.2.2 Sample Metadata".

Section 3.2 also contains an "(see section 6.7.1)" in the bullet list, that 
is obsolete.

Michael