XSL PR - minor errors

some minor errors I found in the XSL PR:

6.4.2 fo:root
Common Accessibility Properties is not listed as applicable properties, 
but in [7.4.1 "source-document"] "W3C Accessibility guidelines, ..., 
strongly encourage the use of this property either on the fo:root or..."

7.10.1 "margin-top"
7.10.2 "margin-bottom"
Initial:  0 
"0" is not valid <length> in XSL. It should be "0pt".

6.4.5 fo:page-sequence
The term "normal-sequence-reference-areas" should be changed to "normal-
flow-reference-areas".

Appendix F Changes since the Candidate Recommendation (Non-Normative)
typo: "spaced" --> "spaces"

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Shinyu Murakami
Antenna House XSL Formatter team