Test

file: document length-limits for dma_read/write funcs taking vector<iovec> #1145

Job	Run time
Test with C++20 modules enabled / test	14m 19s
Test with DPDK enabled / test	18m 44s
Test (clang++, C++20, dev) / test	9m 44s
Test (clang++, C++20, debug) / test	11m 31s
Test (clang++, C++20, release) / test	11m 13s
Test (clang++, C++23, debug) / test	12m 33s
Test (clang++, C++23, release) / test	18m 38s
Test (clang++, C++23, dev) / test	9m 56s
Test (g++, C++20, debug) / test	13m 9s
Test (g++, C++20, dev) / test	7m 47s
Test (g++, C++20, release) / test	10m 37s
Test (g++, C++23, debug) / test	13m 37s
Test (g++, C++23, dev) / test	7m 41s
Test (g++, C++23, release) / test	11m 4s
	2h 50m 33s

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