docs: clarify address.codehash for empty account

[pcaversaccio]

What I did

The EXTCODEHASH of an empty account is not empty(bytes32) but keccak256("") = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470. See EIP-1052.

How I did it

Fixed the docs. Please note that there is no code bug, as any Vyper compiled contract will return 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 for an EOA or an empty account (see here).

How to verify it

• EIP-1052
• Geth

Commit message

docs: clarify `address.codehash` for an empty account

Description for the changelog

• docs: clarify address.codehash for an empty account

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2df916c) 84.02% compared to head (eed5a1e) 84.05%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3711      +/-   ##
==========================================
+ Coverage   84.02%   84.05%   +0.03%     
==========================================
  Files          92       92              
  Lines       13045    13045              
  Branches     2925     2925              
==========================================
+ Hits        10961    10965       +4     
+ Misses       1658     1654       -4     
  Partials      426      426              

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