Document the OPENSSL_TEST_RAND_SEED environment variable #884

Job	Run time
basic_clang	9m 7s
address_ub_sanitizer	15m 6s
basic_gcc	8m 53s
buildtest	13m 48s
check_docs	1m 13s
check_update	2m 14s
check-ansi	4m 14s
enable_brotli_and_asan_ubsan	14m 5s
enable_brotli_and_zstd_dynamic	8m 26s
enable_brotli_dynamic	8m 31s
enable_non-default_options	6m 52s
enable_zstd_and_asan_ubsan	18m 3s
enable_zstd_dynamic	8m 22s
enable-tfo (ubuntu-latest)	8m 5s
enable-tfo (macos-latest)	13m 4s
external-test-cf-quiche	7m 35s
external-tests	17m 8s
fips_and_ktls	9m 3s
external-test-pyca (1.51.0, 3.9)	10m 29s
legacy	7m 0s
memory_sanitizer	23m 30s
minimal	3m 24s
no-deprecated	8m 43s
non-caching	20m 21s
no-legacy	10m 15s
out-of-source-and-install (ubuntu-latest)	11m 8s
threads_sanitizer	8m 39s
no-shared (ubuntu-latest)	8m 3s
out-of-source-and-install (macos-latest)	17m 50s
no-shared (macos-latest)	10m 31s
	5h 13m 42s

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