vhea table, sign of descender

[Hin-Tak Leung]

Hi,
I think one small part of the opentype spec probably needs to be reworded slightly. Recently I have an issue with HarBuzz doing strange values for Microsoft mincho for the descender in vhea.
Looking at ISO/IEC 14496-22:2015, section 5.7.7, in version 1.1 version of the table's "vertTypoDescender" description, it says "... For example, a font with an em of 1000 fUnits will set this field to 500".
Then in the next page, the example is "Minus half the em-square height".
I think in the first description a few "minus" and "-" should be added. Thus the anomaly with Microsoft mincho (its descender field in vhea has a +ve value...)
Hin-Tak
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