murmur3/murmur.go: fix comment (breaking vscode)

murmur3/murmur.go

@@ -24,7 +24,7 @@ type bmixer interface {
 
 type digest struct {
 	clen int      // Digested input cumulative length.
-	tail []byte   // 0 to Size()-1 bytes view of `buf'.
+	tail []byte   // 0 to Size()-1 bytes view of `buf`.
 	buf  [16]byte // Expected (but not required) to be Size() large.
 	bmixer
 }