alt-svc: use of "alternative-protocol" term

[LPardue]

https://httpwg.github.io/http-extensions/alt-svc.html#alternative

Each origin maps to a set of these routes — the default route is derived from the origin itself and the other routes are introduced based on alternative-protocol information.

This looks like it may be a remnant from Alternate-Protocol. Section 2.4 uses the phrase alternative service protocol, which seems a little clearer.

[reschke]

IMHO it really ought to be "alternative-service information".