docs(gateway-oss) update the upstream slots description (#7098)
docs(gateway-oss) update the upstream slots description (#7098)

* docs(gateway-oss) update the upstream slots description

* Update autodoc/admin-api/data/admin-api.lua

Co-authored-by: lena-larionova <f2067920b16f0da6711eb84739d83dcaca411c08@users.noreply.github.com>

Co-authored-by: lena-larionova <f2067920b16f0da6711eb84739d83dcaca411c08@users.noreply.github.com>
Kong/kong,Kong/kong,Kong/kong