Merge bitcoin/bitcoin#34818: doc: fix process name typo in multiprocess.md

c2732146d14e5e0b932b14ea177ac8bcd25c9f84 doc: fix process name typo in multiprocess.md (ViniciusCestarii)

Pull request description:

  In this [flow](https://github.com/bitcoin/bitcoin/blob/master/doc/design/multiprocess.md#example-use-cases-and-flows), the bitcoin-wallet process acts as the client initiating the RPC request, while the bitcoin-node process acts as the server receiving it. So at "The `getBlockHash` method of the generated `Chain` server subclass in `bitcoin-wallet` receives a Cap’n Proto request object with the `height` parameter, and calls the `getBlockHash` method on its local `Chain` object with the provided `height`." it should say bitcoin-node not bitcoin-wallet.

  This PR fix this typo.

ACKs for top commit:
  ryanofsky:
    Code review ACK c2732146d14e5e0b932b14ea177ac8bcd25c9f84. Nice catch!

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@ -175,7 +175,7 @@ sequenceDiagram
4. **Handling in bitcoin-node**
- Upon receiving the request, the Cap'n Proto dispatching code in the `bitcoin-node` process calls the `getBlockHash` method of the `Chain` [server class](#c-server-classes-in-generated-code).
- The server class is automatically generated by the `mpgen` tool from the [`chain.capnp`](https://github.com/ryanofsky/bitcoin/blob/pr/ipc/src/ipc/capnp/chain.capnp) file in [`src/ipc/capnp/`](../../src/ipc/capnp/).
- The `getBlockHash` method of the generated `Chain` server subclass in `bitcoin-wallet` receives a Capn Proto request object with the `height` parameter, and calls the `getBlockHash` method on its local `Chain` object with the provided `height`.
- The `getBlockHash` method of the generated `Chain` server subclass in `bitcoin-node` receives a Capn Proto request object with the `height` parameter, and calls the `getBlockHash` method on its local `Chain` object with the provided `height`.
- When the call returns, it encapsulates the return value in a Capn Proto response, which it sends back to the `bitcoin-wallet` process.
5. **Response and Return**