api-docs: add RPC calls for pagination.

[nodech]

From the changelog:

Wallet RPC

The following new methods have been added:

• listhistory - List history with a limit and in reverse order.
• listhistoryafter - List history after a txid (subsequent pages).
• listhistorybytime - List history by giving a timestamp in epoch seconds
  (block median time past).
• listunconfirmed - List unconfirmed transactions with a limit and in
  reverse order.
• listunconfirmedafter - List unconfirmed transactions after a txid
  (subsequent pages).
• listunconfirmedbytime - List unconfirmed transactions by time they
  where added.

The following methods have been deprecated:

• listtransactions - Use listhistory and the related methods and the
  after argument for results that do not shift when new blocks arrive.