Fix the docs for the inventory plugins.

[abadger]

Documenting the structure of the dictionary to pass in needs to be done
via suboptions rather than putting the structure directoly inside of the
toplevel option.

ISSUE TYPE

• Bugfix Pull Request
• Docs Pull Request

COMPONENT NAME

inventory plugins

ADDITIONAL INFORMATION

@geerlingguy Hey, I'm working on a schema for docs. These inventory plugins are doing things in a non-standard way and I'd like to get this fix applied so that I don't have to specialcase the code to get the documentation to show up on pages like this: https://docs.ansible.com/ansible/latest/plugins/inventory/k8s.html

[codecov]

Codecov Report

Merging #103 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #103   +/-   ##
=======================================
  Coverage   42.98%   42.98%           
=======================================
  Files           3        3           
  Lines         542      542           
  Branches      110      110           
=======================================
  Hits          233      233           
  Misses        266      266           
  Partials       43       43           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2f7b552...d9ece47. Read the comment docs.

[geerlingguy]

LGTM, test failures are unrelated.