minor bug in the XACML 3.0 core spec

Dear all,

while using the XACML 3.0 docs, I noticed
that in some examples the old RequestContextPath XML Attribute of the
<AttributeSelector> is used. 

In order to be consistent with the
AttributeSelector definition under section 5.30, we should change this and
replace RequestContextPath by Path in the examples in section 2.

Best regards

jan