minor glitches wrt 'p:insert'

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In its signature, the 'at-start' option is marked as required, but a
default is specified in the prose -- I think I like the default, and
so it shouldn't be marked as required.

In Example 5, the effect of the displayed insertion is described as
"An hr is inserted before the h:div and the resulting version replaces
the original h:div." -- this should read something like "An hr is
inserted as the first child of each h:div, and the resulting version
replaces the original h:div."

ht
- -- 
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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