Update health_api.py

[aapplebaum]

Added description tag to response_schema

Description

(insert summary)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[github-actions]

Wohoo! Your first PR -- thanks for contributing!

[codecov]

Codecov Report

Merging #2412 (2f5a655) into master (7e323ea) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2412   +/-   ##
=======================================
  Coverage   73.22%   73.22%           
=======================================
  Files         112      112           
  Lines        8068     8068           
=======================================
  Hits         5908     5908           
  Misses       2160     2160           

Impacted Files	Coverage Δ
app/api/v2/handlers/health_api.py	100.00% <100.00%> (ø)

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[wbooth]

LGTM