Action-92: Propose spec text to resolve ISSUE-32

ISSUE-32: Do we specify that path-specificity applies only to 
hierarchical URI schemes?

This may be unnecessary, although we could add a clarifying note. The 
spec currently only supports path as part of a host-source, and defines 
host-source as:

   host-source     = [ scheme "://" ] host [ port ] [ path ]

This implies path only works for hierarchical schemes since the host is 
required in order to have a path, and the hierarchical "://" delimiter 
is required if there's a scheme along with a host.

-Dan Veditz