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doc: improve NODE_NETWORK_LIMITED documentation per BIP159

Placeholder Jon Atack requested to merge github/fork/jonatack/2025-02-NODE_NETWORK_LIMITED-documentation into master

Per BIP159, the definition is:

NODE_NETWORK_LIMITED || bit 10 (0x400) || If signaled, the peer MUST be capable of serving at least the last 288 blocks (~2 days).

Fix our documentation related to this, and add BIP159 mentions where relevant.

Originally this PR also tried to clarify the following, but it was dropped in response to review:

NODE_NETWORK_LIMITED is set by default, and it only signals a pruned or otherwise limited node if NODE_NETWORK is not also set. See the init setup logic or IsLimitedPeer() in src/net_processing.cpp for examples.

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