1. updated the available for line

[LeonLu2]

closes #679

Prerequisites:

• Unless it is a documentation hotfix it should be merged against the dev branch
• Branch is up-to-date with the branch to be merged with, i.e. dev
• Build is successful
• Code is cleaned up and formatted

Summary

Issue:
the available for line of JHU Cases and Deaths page need to update with 'hhs' and 'nation'

Fix:

1. update the line with elements 'hhs' and 'nation'

[krivard]

👍

[krivard]

Please use the PR template -- it makes reviews much quicker. I've edited the description of this PR with how it should typically look when a PR is ready for review.