fix: change link to kademlia-peer-selection.md

[lechpzn]

previous one is not working anymore.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.79%. Comparing base (29b5472) to head (051dd92).

Additional details and impacted files

Flag	Coverage Δ
block	84.33% <ø> (ø)
blockchain	89.32% <ø> (ø)
common	97.50% <ø> (ø)
devp2p	86.78% <ø> (?)
evm	73.08% <ø> (ø)
mpt	89.74% <ø> (?)
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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