chore: fix dead links

[staffik]

https://github.com/near/NEPs/actions/runs/13061179058/job/36444299126?pr=568 failed, fixing it here as it is unrelated to that PR.

Fixing dead links in old files, makes linter enforce I fix other stuff too.

[staffik]

Could not use ```json, ```ts, etc. because of this rule

[Trisfald]

Thanks!

[wacban]

LGTM but I think you'll need a nep moderator approval.

[staffik]

@near/nep-moderators could you stamp please?

[frol]

@staffik Thank you!

@race-of-sloths score 3

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