Add Verify export comment

Author: qdm12

lib/trie/proof/verify.go

@@ -21,6 +21,9 @@ var (
 
 // Verify verifies a given key and value belongs to the trie by creating
 // a proof trie based on the encoded proof nodes given. The order of proofs is ignored.
+// A nil error is returned on success.
+// Note this is exported because it is imported and used by:
+// https://github.com/ComposableFi/ibc-go/blob/6d62edaa1a3cb0768c430dab81bb195e0b0c72db/modules/light-clients/11-beefy/types/client_state.go#L78
 func Verify(encodedProofNodes [][]byte, rootHash, key, value []byte) (err error) {
 	proofTrie, err := buildTrie(encodedProofNodes, rootHash)
 	if err != nil {