QUIC: Update MD files for 3.1.5 #343

Job	Run time
basic_clang	4m 18s
basic_gcc	4m 15s
check_docs	56s
check_update	1m 22s
check-ansi	2m 26s
minimal	1m 54s
no-deprecated	3m 49s
address_ub_sanitizer	9m 1s
self-hosted (freebsd-13.2)	1s
self-hosted (ubuntu-arm64-22.04)	1s
enable_non-default_options	3m 27s
fips_and_ktls	4m 11s
memory_sanitizer	18m 56s
no-legacy	4m 11s
non-caching	5m 15s
no-shared-macos	4m 22s
no-shared-ubuntu	3m 13s
threads_sanitizer	3m 29s
buildtest	5m 45s
external-test-pyca (1.51.0, 3.9)	7m 8s
external-tests	12m 34s
legacy	3m 19s
out-of-readonly-source-and-install-macos	10m 54s
out-of-readonly-source-and-install-ubuntu	6m 58s
	2h 1m 45s

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