Template update re: OASIS links

One last minor item - due to the redesign of the OASIS website, most links to items there (www.oasis-open.org) now have a terminating slash. This occurs only once in the Notes - in the "Notices" section, there is a hyperlink under "Policy" which should be "https://www.oasis-open.org/policies-guidelines/ipr/". [This last item comes more into play for standards-track documents, where there are five or six similar changes... hope this can be incorporated into the DocBook templates with their next revision.]