docs: Add release notes for Boost 1.86 (#749) #553

Job	Run time
windows (msvc-14.2, 14,17, 32,64, windows-2019)	33m 39s
posix (gcc-6, 14,1z, ubuntu-latest, ubuntu:18.04, g++-6)	7s
windows (gcc, 14,17, 64, windows-2019)	1m 16s
posix (gcc-7, 14,17, g++-7, ubuntu-20.04)	12m 8s
windows (msvc-14.3, 14,17, 32,64, windows-2022)	35m 15s
posix (gcc-8, 14, ubuntu-20.04, g++-8)	6m 29s
posix (gcc-9, 14,17, ubuntu-20.04, g++-9)	15m 3s
posix (gcc-10, 14,17, ubuntu-20.04, g++-10)	13m 7s
posix (clang, clang++-3.9, 14, ubuntu-latest, ubuntu:18.04, clang-3.9)	4s
posix (clang, clang++-4.0, 14, ubuntu-latest, ubuntu:18.04, clang-4.0)	5s
posix (clang, clang++-5.0, 14,1z, ubuntu-latest, ubuntu:18.04, clang-5.0)	5s
posix (clang, clang++-6.0, 14,17, ubuntu-20.04, clang-6.0)	14m 36s
posix (clang, clang++-7, 14,17, ubuntu-20.04, clang-7)	13m 31s
posix (clang, clang++-8, 14,17, ubuntu-20.04, clang-8)	13m 58s
posix (clang, clang++-9, 14,17, ubuntu-20.04, clang-9)	14m 32s
posix (clang, clang++-10, 14,17, ubuntu-20.04)	14m 47s
posix (clang, 14,17, macos-11)	1s
	3h 8m 43s

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