Re: [MathML3-last-call] mpadded attr example has a space it shouldn't

The second mpadded example is:

<mrow>
   <mi>x</mi>
   <mpadded width="+90% width" height="+0.3ex" depth="+0.3ex">
     <mi>y</mi>
   </mpadded>
   <mi>z</mi>
</mrow>


The width value "+90% width" has a space in it.  The spec earlier says,
"Formally, spaces are not allowed within these values, but implementers may
wish to ignore such spaces to maximize backward compatibility."  It should
go from the example.