Make group quantities consistent across data interfaces / wrapper types

[ehennestad]

Fix #611

Summary of changes

Change quantity from "*" to "+" for groups of wrapper types

Checklist

For all schema changes:

• Add release notes for the PR to docs/format/source/format_release_notes.rst.
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.
• Make sure that hdmf-common-schema points to the latest release and not the latest commit on the main branch.

[stephprince]

Looks good to me! Thanks @ehennestad