https://bugs.openldap.org/show_bug.cgi?id=8835
--- Comment #1 from Quanah Gibson-Mount quanah@openldap.org --- So at least at the moment, the 3.0.0 alpha for OpenSSL still includes c_rehash.
Given that "rehash" is relatively new (1.1.0 line) and c_rehash doesn't seem to be going anywhere soon, I'm actually inclined to leave the admin guide as-is for now, unless we're planning on updating the minimum required version of OpenSSL, since c_rehash works with all versions we support.