fixup! fixup! PKCS7 and SMIME: improve documentation w.r.t. untrusted… #964

Job	Run time
compiler (gcc-7, ubuntu-20.04)	7m 47s
compiler (gcc-8, ubuntu-20.04)	7m 35s
compiler (gcc-9, ubuntu-20.04)	8m 55s
compiler (gcc-10, ubuntu-20.04)	7m 42s
compiler (gcc-11, ubuntu-22.04)	7m 56s
compiler (gcc-12, ubuntu-22.04)	9m 17s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	8m 40s
compiler (clang-6.0, ubuntu-20.04)	7m 59s
compiler (clang-7, ubuntu-20.04)	7m 39s
compiler (clang-8, ubuntu-20.04)	7m 51s
compiler (clang-9, ubuntu-20.04)	8m 51s
compiler (clang-10, ubuntu-20.04)	7m 47s
compiler (clang-11, ubuntu-20.04)	7m 52s
compiler (clang-12, ubuntu-20.04)	7m 55s
compiler (clang-13, ubuntu-22.04)	7m 58s
compiler (clang-14, ubuntu-22.04)	8m 6s
compiler (clang-15, ubuntu-22.04, jammy)	8m 17s
compiler (clang-16, ubuntu-22.04, jammy)	9m 22s
	2h 27m 29s

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