Outdated example for iterating through keyset in v2/jwk readme

[jhiemstrawisc]

I was working with the /v2/jwks package and following along the example under the header "Parse and use a JWK key:". It looks like the code in the example for iterating through a keyset might be leftover from v1, as it contains:
for it := set.Iterate(context.Background()); it.Next(context.Background()); {

This did not work for me, but using set.Keys(context.Background()) does work to return a functioning iterator. I realized this after reading the v1->v2 changelog. Am I correct in thinking this should be updated?

[lestrrat]

Yes, it should be updated!

[lestrrat]

I think #971 and #972 fixes this. Please reopen if this was not enough. Thanks for the headsup