capability-zoom-swap-vectors note missing link

[Malvoz]

UCR-MapML-Matrix/mapml-ucr.json

Line 2709 in 0d97447

"notes": "Handled through tile negotiation with server; not yet addressed as adaptive client-side feature; oustanding issue, ISSUE-7",

ISSUE-7

Which issue 7 does this refer to? In the MapML repo? We should use an <a> element and link to it.