add 'uris' as an alias for 'application_uris' in environment-variable.html [#67807668]
add 'uris' as an alias for 'application_uris' in environment-variable.html [#67807668]

shalako/docs-dev-guide,bridgetkromhout/docs-dev-guide,krujos/docs-dev-guide,cloudfoundry/docs-dev-guide,cwest/docs-dev-guide,logit-io/docs-dev-guide