3074: use only 1 byte for v value

EIPS/eip-3074.md

@@ -69,10 +69,10 @@ A new opcode `AUTH` shall be created at `0xf6`. It shall take three stack elemen
 
 The final two stack arguments (`offset` and `length`) describe a range of memory. The format of the contents of that range is:
 
- - `memory[offset    : offset+32 ]` - `yParity`
- - `memory[offset+32 : offset+64 ]` - `r`
- - `memory[offset+64 : offset+96 ]` - `s`
- - `memory[offset+96 : offset+128]` - `commit`
+ - `memory[offset    : offset+1 ]` - `yParity`
+ - `memory[offset+32 : offset+33]` - `r`
+ - `memory[offset+64 : offset+65]` - `s`
+ - `memory[offset+96 : offset+97]` - `commit`
 
 #### Output
 
@@ -88,7 +88,7 @@ Memory is not modified by this instruction.
 
 #### Behavior
 
-If `length` is greater than 128, the extra bytes are ignored for signature verification (they still incur a gas cost as defined later). Bytes outside the range (in the event `length` is less than 128) are treated as if they had been zeroes.
+If `length` is greater than 97, the extra bytes are ignored for signature verification (they still incur a gas cost as defined later). Bytes outside the range (in the event `length` is less than 97) are treated as if they had been zeroes.
 
 `authority` is the address of the account which generated the signature.