docs(errors): sort errors declaration

Author: sammyne

errors.go

@@ -6,43 +6,43 @@ import (
 )
 
 var (
-	// ErrDeriveHardFromPublic describes an error in which the caller
-	// attempted to derive a hardened extended key from a public key.
-	ErrDeriveHardFromPublic = errors.New("cannot derive a hardened key " +
-		"from a public key")
+	// ErrBadChecksum describes an error in which the checksum encoded with
+	// a serialized extended key does not match the calculated value.
+	ErrBadChecksum = errors.New("bad extended key checksum")
 
 	// ErrDeriveBeyondMaxDepth describes an error in which the caller
-	// has attempted to derive more than 255 keys from a root key.
+	// has attempted to derive a key chain longer than 255 from a root key.
 	ErrDeriveBeyondMaxDepth = errors.New("cannot derive a key with more than " +
+
 		"255 indices in its path")
+	// ErrDeriveHardFromPublic describes an error in which the caller
+	// attempted to derive a hardened extended key from a public key.
+	ErrDeriveHardFromPublic = errors.New("cannot derive a hardened key " +
+		"from a public key")
 
 	// ErrInvalidChild describes an error in which the child at a specific
 	// index is invalid due to the derived key falling outside of the valid
-	// range for secp256k1 private keys.  This error indicates the caller
+	// range for secp256k1 private keys. This error indicates the caller
 	// should simply ignore the invalid child extended key at this index and
 	// increment to the next index.
 	ErrInvalidChild = errors.New("the extended key at this index is invalid")
 
-	// ErrUnusableSeed describes an error in which the provided seed is not
-	// usable due to the derived key falling outside of the valid range for
-	// secp256k1 private keys.  This error indicates the caller must choose
-	// another seed.
-	ErrUnusableSeed = errors.New("unusable seed")
+	// ErrInvalidKeyLen describes an error in which the provided serialized
+	// key isn't of the expected length.
+	ErrInvalidKeyLen = errors.New("the provided serialized extended key " +
+		"length is invalid")
 
 	// ErrInvalidSeedLen describes an error in which the provided seed or
 	// seed length is not in the allowed range.
 	ErrInvalidSeedLen = fmt.Errorf("seed length must be between %d and %d "+
 		"bits", MinSeedBytes*8, MaxSeedBytes*8)
 
-	// ErrBadChecksum describes an error in which the checksum encoded with
-	// a serialized extended key does not match the calculated value.
-	ErrBadChecksum = errors.New("bad extended key checksum")
-
-	// ErrInvalidKeyLen describes an error in which the provided serialized
-	// key is not the expected length.
-	ErrInvalidKeyLen = errors.New("the provided serialized extended key " +
-		"length is invalid")
-
 	// ErrNoEnoughEntropy signals more entropy is needed
 	ErrNoEnoughEntropy = errors.New("more entropy is needed")
+
+	// ErrUnusableSeed describes an error in which the provided seed is not
+	// usable due to the derived key falling outside of the valid range for
+	// secp256k1 private keys.  This error indicates the caller must choose
+	// another seed.
+	ErrUnusableSeed = errors.New("unusable seed")
 )