search: fix cases where `.suggest` gets only one item back

[dgw]

xmltodict presents a response with only one <CompleteSuggestion> element as just a plain OrderedDict, without any list wrapping it. This PR fixes the behavior, adds an @example test covering a query that currently returns only one result, and updates the VCR cassettes for all @example tests.

As a bonus, which example should appear in .help suggest is now explicitly specified with user_help=True.

Checklist

• [x] I have read CONTRIBUTING.md
• [x] I can and do license this contribution under the EFLv2
• [x] No issues are reported by make qa (runs make lint and make test)
  • Same as my last PR, an unrelated error appears in my local make lint run that doesn't appear in our CI.
• [x] I have tested the functionality of the things this change touches