tutorial: explain the use case of rethrow_exception and coroutine::ex… #494

Job	Run time
Test with DPDK enabled / test	11m 24s
Test with C++20 modules enabled / test	11m 29s
Test (clang++, C++20, dev) / test	4m 34s
Test (clang++, C++23, debug) / test	6m 52s
Test (clang++, C++20, release) / test	4m 40s
Test (clang++, C++23, dev) / test	4m 48s
Test (clang++, C++23, release) / test	15m 49s
Test (g++, C++20, debug) / test	6m 52s
Test (g++, C++20, dev) / test	4m 8s
Test (g++, C++20, release) / test	5m 1s
Test (clang++, C++20, debug) / test	6m 54s
Test (g++, C++23, debug) / test	7m 21s
Test (g++, C++23, dev) / test	4m 13s
Test (g++, C++23, release) / test	5m 12s
	1h 39m 17s

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