Pass some of wallet/rpcwallet RPC results and examples to RPCHelpMan
Pass some of wallet/rpcwallet RPC results and examples to RPCHelpMan

Summary:
Applies the first part of the full changes to wallet/rpcwallet

Partial backport of Core [[https://github.com/bitcoin/bitcoin/pull/14987 | PR14987]]

Test Plan:
On master:
  ninja
  ./bitcoind
  ./bitcoin-cli help > RPCs
  ./getrpchelps.sh RPCs master
Then on the patched branch:
  ninja
  ./bitcoind
  ./getrpchelps.sh RPCs patched
  ./checkrpc.sh RPCs master patched rpcwallet1.diff
Verify changes in `rpcwallet1.diff`.

Scripts:
{F4258185}
{F4258184}

rpcwallet1.diff:
{F4265793}

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien, deadalnix

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien, deadalnix

Subscribers: deadalnix, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5899

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