fix: broken link

Signed-off-by: ChrisJBurns <[email protected]>

USAGE.md

@@ -1 +1 @@
-> Note of deprecation: This document has been migrated and merged into into [`sigstore/docs/sign`](https://github.com/sigstore/docs/blob/main/content/en/cosign/sign.md) and `sigstore/docs/verify`](https://github.com/sigstore/docs/blob/main/content/en/cosign/sign.md) as part of [documentation migration](https://github.com/sigstore/cosign/issues/822). To view the live docs page, go to: https://docs.sigstore.dev/cosign/sign and https://docs.sigstore.dev/cosign/verify
+> Note of deprecation: This document has been migrated and merged into into [`sigstore/docs/sign`](https://github.com/sigstore/docs/blob/main/content/en/cosign/sign.md) and [`sigstore/docs/verify`](https://github.com/sigstore/docs/blob/main/content/en/cosign/sign.md) as part of [documentation migration](https://github.com/sigstore/cosign/issues/822). To view the live docs page, go to: https://docs.sigstore.dev/cosign/sign and https://docs.sigstore.dev/cosign/verify