Merge #16448: doc: add note on precedence of options in bitcoin.conf

fa2f991fa2 doc: add note on precedence of options in bitcoin.conf (Torkel Rogstad)

Pull request description:

  This was a good addition to the docs, but the PR was closed. So I've cherry-picked the commit and fixed up Russ's comments as well as the linter issue.

ACKs for top commit:
  laanwj:
    ACK fa2f991fa2
  hebasto:
    ACK fa2f991fa2, I have reviewed the code and it looks OK, I agree it can be merged.
  jamesob:
    ACK fa2f991fa2
  jonatack:
    ACK fa2f991fa2
  ryanofsky:
    ACK fa2f991fa2. Only suggested changes since previous review.

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@ -30,6 +30,21 @@ Network specific options can be:
- placed into sections with headers `[main]` (not `[mainnet]`), `[test]` (not `[testnet]`) or `[regtest]`;
- prefixed with a chain name; e.g., `regtest.maxmempool=100`.
Network specific options take precedence over non-network specific options.
If multiple values for the same option are found with the same precedence, the
first one is generally chosen.
This means that given the following configuration, `regtest.rpcport` is set to `3000`:
```
regtest=1
rpcport=2000
regtest.rpcport=3000
[regtest]
rpcport=4000
```
## Configuration File Path
The configuration file is not automatically created; you can create it using your favorite text editor. By default, the configuration file name is `bitcoin.conf` and it is located in the Bitcoin data directory, but both the Bitcoin data directory and the configuration file path may be changed using the `-datadir` and `-conf` command-line options.