docs: update outdated GeneralStateTests link

[LarryArnault45]

Nothing fancy just fixed a outdated link:
https://github.com/ethereum/tests/tree/develop/BlockchainTests/GeneralStateTests - outdated
https://github.com/ethereum/tests/tree/develop/docs/test_types/TestStructures/GeneralStateTests - new

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.34%. Comparing base (6d6f7d5) to head (f8081b1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	84.33% <ø> (ø)
blockchain	89.32% <ø> (ø)
client	67.60% <ø> (-0.02%)	⬇️
common	97.50% <ø> (ø)
devp2p	86.78% <ø> (ø)
evm	73.08% <ø> (ø)
mpt	90.05% <ø> (+0.30%)	⬆️
statemanager	69.06% <ø> (ø)
static	99.11% <ø> (ø)
tx	89.83% <ø> (ø)
util	88.69% <ø> (ø)
vm	55.31% <ø> (ø)

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[holgerd77]

LGTM