Per @MariusVanDerWijden's review feedback, tighten the change to match
geth's existing style:
- Drop the MarkConsensusExpected/MarkConsensusContacted/ConsensusReady
doc paragraphs on Ethereum; collapse the field comments to single
trailing lines matching eth/handler.go's atomic.Bool style.
- Rename the unexported accessors to MarkCLExpected/MarkCLContacted
(catalyst can't reach the fields directly).
- Drop the multi-line comments at the catalyst call sites — the method
names are self-describing.
- Trim the Backend.ConsensusReady() interface comment and EthAPIBackend
wrapper comment.
- Replace the verbose docstring on EthereumAPI.Syncing with a single
reference to #33687.
- Drop the long doc comments on the syncing_test.go cases; rename test
functions to short forms (TestSyncingBeforeCLContact, etc.).
No behavioural change. Run: `go test ./internal/ethapi/ -count=1`.
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