fixup! Update dtls 1.3 design doc based on current implementation #255

Job	Run time
address_ub_sanitizer	9m 27s
basic_clang	5m 26s
basic_gcc	5m 2s
check_docs	52s
check_update	1m 18s
check-ansi	2m 41s
memory_sanitizer	18m 24s
minimal	2m 21s
non-caching	13m 18s
no-deprecated	4m 45s
no-shared (ubuntu-latest)	3m 39s
no-shared (macos-latest)	2m 48s
buildtest	6m 27s
enable_brotli_and_asan_ubsan	8m 48s
enable_brotli_and_zstd_dynamic	4m 51s
enable_brotli_dynamic	4m 49s
enable_non-default_options	4m 11s
enable_zstd_and_asan_ubsan	8m 52s
enable_zstd_dynamic	4m 40s
enable-tfo (ubuntu-latest)	4m 39s
fips_and_ktls	5m 4s
enable-tfo (macos-latest)	3m 32s
legacy	3m 51s
no-legacy	5m 8s
out-of-source-and-install (ubuntu-latest)	1s
threads_sanitizer	5m 8s
external-test-cf-quiche	4m 10s
out-of-source-and-install (macos-latest)	3m 39s
external-test-pyca (1.51.0, 3.9)	7m 34s
external-tests	11m 15s
	2h 46m 40s

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