Explain why TSV isn't Sendable. #344

Job	Run time
Soundness / Documentation check	2m 3s
Soundness / Broken symlinks check	3s
Soundness / API breakage check	2m 29s
Integration Tests / Linux (5.8)	12m 52s
Integration Tests / Linux (5.9)	14m 32s
Soundness / Format check	53s
Soundness / License headers check	8s
Soundness / Shell check	6s
Integration Tests / Linux (5.10)	14m 10s
Integration Tests / Linux (nightly-6.0)	16m 53s
Soundness / Unacceptable language check	3s
Integration Tests / Linux (nightly-main)	17m 25s
Swift 6 Language Mode / Swift 6 language mode	55s
Benchmarks / Benchmarks / Linux (5.8)	3m 3s
Cxx interop / Cxx interop / Linux (5.8)	1m 8s
Unit tests / Unit tests / Linux (5.8)	3m 15s
Benchmarks / Benchmarks / Linux (5.9)	5m 8s
Cxx interop / Cxx interop / Linux (5.9)	1m 15s
Unit tests / Unit tests / Linux (5.9)	3m 22s
Benchmarks / Benchmarks / Linux (5.10)	5m 5s
Cxx interop / Cxx interop / Linux (5.10)	1m 9s
Unit tests / Unit tests / Linux (5.10)	3m 30s
Benchmarks / Benchmarks / Linux (nightly-6.0)	6m 26s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 47s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 18s
Benchmarks / Benchmarks / Linux (nightly-main)	6m 9s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 44s
Unit tests / Unit tests / Linux (nightly-main)	4m 18s
	2h 14m 9s

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