Update HeaderSpec.md

Author: john-h-k

docs/HeaderSpec.md

@@ -24,11 +24,11 @@
 
 ## Header items
 
-| Argument      | Meaning       | Values|
-| ------------- |-------------| ----- |
-| <a href="#HMAC">HMAC</a> | The verification hash used to confirm the file hasn't changed | 128 - 512 bit byte array (16-64 bytes) |
+| Argument                                               | Meaning                         | Values|
+| ------------------------------------------------------ |-------------------------------- | ------------------------------------ |
+| <a href="#HMAC">HMAC</a>                               | The verification hash used to confirm the file hasn't changed | 128 - 512 bit byte array (16-64 bytes) |
 | <a href="#KEYVERIFICATIONHASH">KEYVERIFICATIONHASH</a> | A hash of the key to verify if the password is correct | 128 - 512 bit byte array (16-64 bytes) |
-| <a href="#ENCRYPTMODE">ENCRYPTMODE</a> | A byte representing the encryption type | A string in the table of <a href="#ENCRYPTMODE">ENCRYPTMODE</a> page, and the (undefined ATM -- TODO) enumeration |
+| <a href="#ENCRYPTMODE">ENCRYPTMODE</a>                 | A byte representing the encryption type | A string in the table of <a href="#ENCRYPTMODE">ENCRYPTMODE</a> page, and the (undefined ATM -- TODO) enumeration |
 
 ### <p id="HMAC">HMAC</p>