Merge #17283: rpc: improve getaddressinfo test coverage, help, code docs

33f5fc32e5bfbe1e89c4d20ce455bcc6dc194151 test: add rpc getaddressinfo labels test coverage (Jon Atack)
0f3539ac6d772fc646b5f184fa1efe77bf632f6a test: add listlabels test in wallet_labels.py (Jon Atack)
1388de83900eaced906d369fe9e8887ae74b2dcf rpc: add getaddressinfo code documentation (Jon Atack)
2ee0cb3330ccf70f0540cb42370796e32eff1569 rpc: update getaddressinfo RPCExamples to bech32 (Jon Atack)
8d1ed0c263f8cdff7189f02040b5d02238d93da0 rpc: clarify label vs labels in getaddressinfo RPCHelpman (Jon Atack)
5a0ed850700dfb19167d40b38f80313bd5e427ca rpc: improve getaddressinfo RPCHelpman content (Jon Atack)
70cda342cd20d0e0cd9f28405457544036968f2d rpc: improve getaddressinfo RPCHelpman formatting (Jon Atack)

Pull request description:

  This PR is a continuation of the work in https://github.com/bitcoin/bitcoin/pull/12892.

  Main motivations:
  - There is currently no test coverage for the getaddressinfo `labels` response. Coverage here is a prerequisite before deprecating the `label` response or adding multiple labels per address.
  - `bitcoin-cli help getaddressinfo` returns a few content errors, difficult-to-read formatting, and no explanation why it returns both `label` and `labels` and how they relate, which can be confusing for application developers.

  Changes by order of commits:
  - [x] improve/fix getaddressinfo RPCHelpman layout formatting
  - [x] improve/fix getaddressinfo RPCHelpman content
  - [x] clarify the `label` and `labels` fields in getaddressinfo RPCHelpman
  - [x] update getaddressinfo RPCExamples addresses to bech32
  - [x] add getaddressinfo code docs
  - [x] add a `listlabels` test assertion in wallet_labels.py
  - [x] add missing getaddressinfo `labels` test coverage and improve the existing `label` tests

  Here are gists of the CLI help output:
  [`bitcoin-cli help getaddressinfo` before this PR](https://gist.github.com/jonatack/022af5221a85c069780359a22643c810)
  [`bitcoin-cli help getaddressinfo` after this PR](https://gist.github.com/jonatack/4ee5f6abc62a3d99269570206a5f90ba)

  It seems we ought to begin a deprecation process for the getaddressinfo `label` field? If yes, I have a follow-up ready. _--> EDIT: Deprecation follow-ups #17578 and #17585 now build on this PR._

ACKs for top commit:
  fjahr:
    Re-ACK 33f5fc32e5bfbe1e89c4d20ce455bcc6dc194151
  jnewbery:
    ACK 33f5fc32e5bfbe1e89c4d20ce455bcc6dc194151.

Tree-SHA512: a001aa863090ec2566a31059477945b1c303ebeb430b33472f8b150e420fa5742fc33bca9d95571746395b607f43f6078dd5b53e238ac1f3fc648b51c8f79a07

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