R4R: Add warning and disclaimer

[ebuchman]

Legal recommendations :)

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added entries in PENDING.md with issue #

• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #3572 into develop will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #3572      +/-   ##
===========================================
+ Coverage    61.39%   61.42%   +0.02%     
===========================================
  Files          185      185              
  Lines        14006    14006              
===========================================
+ Hits          8599     8603       +4     
+ Misses        4855     4851       -4     
  Partials       552      552