Misleading comments in test filler

[xrchz]

tests/src/GeneralStateTestsFiller/VMTests/vmTests/calldatacopyFiller.yml

Line 171 in 9201075

; Put a 0x10 byte long value in zero (each byte is two hex digits)

The comments claim a 0x10 byte long value is going into memory, but then the value is 0x11 bytes. I think this may be related to another misleading comment earlier that says an mload should produce 0 when it in fact produces 0x12.

[winsvega]

feel free to correct