lib/crypto: Add documentation about zeroization of key and context data

Add a central document about zeroization in libcrypto so we don't
have to repeat this information in the individual kernel doc

lib/crypto: Add documentation about zeroization of key and context data

Add a central document about zeroization in libcrypto so we don't
have to repeat this information in the individual kernel docs of
the zeroization functions all over the place.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260916095022.604354-14-thuth@redhat.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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