[xacml-comment] The prefix "function:" is used in Section 4 Examples

The namespace prefix "function:" is used in the explanation for the
examples in Section 4.
There are too many places where it is used and so I cannot list all here.
All should be replaced with the correct URIs.

E.g.,
function:string-equal
Function:string-equal (Capital F is used)
function:and
function:string-one-and-only
function:date-less-or-equal
function:date-one-and-only



Satoshi Hada
IBM Tokyo Research Laboratory
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