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Merge bitcoin/bitcoin#31985: doc: Bring reduce-memory.md up to date

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fff4f93dff doc: Bring reduce-memory.md up to date (laanwj)

Pull request description:

  Update default number of RPC threads to 16 (#31215) and remove reference to very old version of bitcoin core.

  Let me know if you notice other mismatches with current defaults.

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@ -16,7 +16,7 @@ The size of some in-memory caches can be reduced. As caches trade off memory usa
- The minimum value for `-maxmempool` is 5.
- A lower maximum mempool size means that transactions will be evicted sooner. This will affect any uses of `bitcoind` that process unconfirmed transactions.
- Since `0.14.0`, unused memory allocated to the mempool (default: 300MB) is shared with the UTXO cache, so when trying to reduce memory usage you should limit the mempool, with the `-maxmempool` command line argument.
- The unused memory allocated to the mempool (default: 300MB) is shared with the UTXO cache, so when trying to reduce memory usage you should limit the mempool, with the `-maxmempool` command line argument.
- To disable most of the mempool functionality there is the `-blocksonly` option. This will reduce the default memory usage to 5MB and make the client opt out of receiving (and thus relaying) transactions, except from peers who have the `relay` permission set (e.g. whitelisted peers), and as part of blocks.
@ -39,7 +39,7 @@ threads take up 8MiB for the thread stack on a 64-bit system, and 4MiB in a
32-bit system.
- `-par=<n>` - the number of script verification threads, defaults to the number of cores in the system minus one.
- `-rpcthreads=<n>` - the number of threads used for processing RPC requests, defaults to `4`.
- `-rpcthreads=<n>` - the number of threads used for processing RPC requests, defaults to `16`.
## Linux specific