Treat raw strings like other docstrings

[JelleZijlstra]

Fixes #3944

[github-actions]

diff-shades results comparing this PR (f2d7e95) to main (1648ac5). The full diff is available in the logs under the "Generate HTML diff report" step.

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│ 2 projects & 5 files changed / 8 changes [+8/-0]       │
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│ ... out of 2 497 884 lines, 11 747 files & 23 projects │
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Differences found.

What is this? | Workflow run | diff-shades documentation

[hauntsaninja]

Upper case R test doesn't test too much, but looks good!