storage: doc that key location must match bucket.
@@ -505,6 +505,7 @@ type BucketEncryption struct {
// A Cloud KMS key name, in the form
// projects/P/locations/L/keyRings/R/cryptoKeys/K, that will be used to encrypt
// objects inserted into this bucket, if no encryption method is specified.
+ // The key's location must be the same as the bucket's.
DefaultKMSKeyName string
}
