fix links to Notifications API V1 and V2 documentation in notifications_api template variables
fix links to Notifications API V1 and V2 documentation in notifications_api template variables

cwest/docs-book-cloudfoundry,bridgetkromhout/docs-book-cloudfoundry,cloudfoundry/docs-book-cloudfoundry,shalako/docs-book-cloudfoundry,cwest/docs-book-cloudfoundry,swisscom/docs-appcloud-book,cloudfoundry/docs-book-cloudfoundry,bridgetkromhout/docs-book-cloudfoundry,swisscom/docs-appcloud-book,swisscom/docs-appcloud-book,shalako/docs-book-cloudfoundry,shalako/docs-book-cloudfoundry,cloudfoundry/docs-book-cloudfoundry,bridgetkromhout/docs-book-cloudfoundry,cloudfoundry/docs-book-cloudfoundry,cwest/docs-book-cloudfoundry,shalako/docs-book-cloudfoundry,swisscom/docs-appcloud-book,cwest/docs-book-cloudfoundry,bridgetkromhout/docs-book-cloudfoundry