add doc for local validation

lib/block/validation/local/block_signature.ex

 defmodule Block.Validation.Local.BlockSignature do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#signature
+  """
   require Logger
 
   def invalid_g1_block() do

lib/block/validation/local/block_time.ex

 defmodule Block.Validation.Local.BlockTime do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#dates-1
+  """
   require Logger
 
   # @default_avg_gen_time 16 * 60

lib/block/validation/local/check_previous_issuer.ex

 defmodule Block.Validation.Local.PreIssuer do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#previousissuer
+  """
   def valid(block) do
     not (block["number"] == 0 and
            block["previousIssuer"] != nil) and

lib/block/validation/local/check_unit_base.ex

 defmodule Block.Validation.Local.UnitBase do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#unitbase
+  """
   def valid(block) do
     not (block["unitbase"] != 0 and block["number"] == 0)
   end

lib/block/validation/local/identity_signaure.ex

 defmodule Block.Validation.Local.IdentitySignature do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#identities
+  """
   def valid(block) do
     Doc.Identity.local_validation(block["identities"], block["currency"])
   end

lib/block/validation/local/inner_hash.ex

 defmodule Block.Validation.Local.InnerHash do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#innerhash
+  """
   def valid(block) do
     computed_hash =
       :crypto.hash(:sha256, _get_raw_inner_part(block))

lib/block/validation/local/membership_sig.ex

 defmodule Block.Validation.Local.MembershipSig do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#memberships-joiners-actives-leavers
+  """
   def valid(block) do
     Doc.Membership.local_validation(
       block["joiners"],

lib/block/validation/local/nonce.ex

 defmodule Block.Validation.Local.Nonce do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#nonce
+  """
   def valid(block) do
     block["nonce"] >= 0
   end

lib/block/validation/local/parameters.ex

 defmodule Block.Validation.Local.Parameters do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#parameters
+  """
   def valid(block) do
     (block["number"] == 0 and block["parameters"] != "") or
       (block["number"] > 0 and block["parameters"] == "")

lib/block/validation/local/previous_hash.ex

 defmodule Block.Validation.Local.PreviousHash do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#previoushash
+  """
   def valid(block) do
     cond do
       block["number"] > 0 ->

lib/block/validation/local/proof_of_work.ex

 defmodule Block.Validation.Local.ProofOfWork do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#proof-of-work
+  """
   def valid(block) do
     required_zeros = div(block["powMin"], 16)
     String.match?(block["hash"], ~r/^0{#{required_zeros}}/)

lib/block/validation/local/transaction/transaction_count.ex

 defmodule Block.Validation.Local.TransactionCount do
+  @moduledoc """
+  Signatures count must be the same as issuers count
+
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#transactions
+  """
   def valid(block) do
     Enum.all?(block["transactions"], fn element ->
       length(element["signatures"]) == length(element["issuers"])

lib/block/validation/local/transaction/transaction_index_inf_nb_issuers.ex

 defmodule Block.Validation.Local.TxInfNbIssuers do
+  @moduledoc """
+
+
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#transactions
+  """
   def valid(block) do
     case block["transactions"] do
       # Since there is no transaction field, there is no transaction to check

lib/block/validation/local/transaction/transaction_input.ex

 defmodule Block.Validation.Local.TransactionInput do
+  @moduledoc """
+  A transaction must have at least 1 source
+
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#transactions
+  """
   def valid(block) do
     case block["transactions"] do
       [] ->

lib/block/validation/local/transaction/transaction_number_of_lines.ex

 defmodule Block.Validation.Local.TransactionNumberOfLines do
+  @moduledoc """
+  A transaction in compact format cannot measure more than 100 lines
+
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#transactions
+  """
   def valid(block) do
     length(block["transactions"]) < 100
   end

lib/block/validation/local/transaction/transaction_version.ex

 defmodule Block.Validation.Local.TransactionVersion do
+  @moduledoc """
+  Transaction's version must be equal to 10.
+
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#transactions
+  """
   def valid(block) do
     Enum.all?(block["transactions"], fn element -> element["version"] == 10 end)
   end

lib/block/validation/local/transaction/tx_sig_ordered.ex

 defmodule Block.Validation.Local.TxSigOrdered do
+  @moduledoc """
+  Signatures are ordered by issuer
+
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#transactions
+  """
   def valid(block) do
     _valid_tx(block["transactions"])
   end

lib/block/validation/local/universal_dividend.ex

 defmodule Block.Validation.Local.UniversalDividend do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#universal-dividend
+  """
   def valid(block) do
     block["number"] === 0 and block["dividend"] === nil
   end

lib/block/validation/local/version.ex

 defmodule Block.Validation.Local.Version do
+  @moduledoc """
+  https://git.duniter.org/documents/rfcs/-/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md#version
+  """
   def valid(block) do
     block["version"] >= 10
   end