fix intentional error

rfc/0006_ws2p_v2.md

@@ -678,9 +678,10 @@ CompactPoolExtCert type description :
 ### HEADs v3
 
 | data name          | size in bytes     | data type  |
-|:------------------:|---------------|------------|
-| step               | 1             | u8         |
+|:------------------:|-------------------|------------|
 | software_size      | 1                 | u8         |
+| soft_version_size  | 1                 | u8         |
+| step               | 1                 | u8         |
 | api_outgoing_conf  | 1                 | u8         |
 | api_incoming_conf  | 1                 | u8         |
 | free_mirror_rooms  | 1                 | u8         |
@@ -689,10 +690,10 @@ CompactPoolExtCert type description :
 | pubkey             | 32                | [u8;32]    |
 | blockstamp         | 36                | Blockstamp |
 | software_name      | software_size     | utf8       |
-| soft_version       | calculate*    | utf8       |
+| soft_version       | soft_version_size | utf8       |
 | signature          | 64                | [u8;64]    |
 
-_*soft_version_size = head_size - 142 - software_size._
+_head_size = 142 + soft_version_size + software_size._
 
 software_size := Field size `software_name` in number of bytes.