crypto/sha3: update from golang.org/x/crypto/sha3 a 80b25ed4

This pulls in the assembly implementation of keccakf1600 for amd64.

crypto/sha3/sha3.go

@@ -42,7 +42,7 @@ type state struct {
 	storage [maxRate]byte
 
 	// Specific to SHA-3 and SHAKE.
-	fixedOutput bool            // whether this is a fixed-ouput-length instance
+	fixedOutput bool            // whether this is a fixed-output-length instance
 	outputLen   int             // the default output size in bytes
 	state       spongeDirection // whether the sponge is absorbing or squeezing
 }