doc: Add initial asmap data documentation

doc/release-process.md

@@ -30,6 +30,7 @@ Release Process
 
 * Update translations see [translation_process.md](/doc/translation_process.md#synchronising-translations).
 * Update hardcoded [seeds](/contrib/seeds/README.md), see [this pull request](https://github.com/bitcoin/bitcoin/pull/27488) for an example.
+* Update embedded asmap data at `/src/node/data/ip_asn.dat`, see [asmap data documentation](./asmap-data.md).
 * Update the following variables in [`src/kernel/chainparams.cpp`](/src/kernel/chainparams.cpp) for mainnet, testnet, and signet:
   - `m_assumed_blockchain_size` and `m_assumed_chain_state_size` with the current size plus some overhead (see
     [this](#how-to-calculate-assumed-blockchain-and-chain-state-size) for information on how to calculate them).