Suggest the use of OpenSSL::PKey::PKey#private_to_pem and #public_to_pem
in the top-level documentation. For new programs, these are recommended
over OpenSSL::PKey::RSA#export (also aliased as #to_s and #to_pem)
unless there is a specific reason to use it, i.e., unless the PKCS#1
output format specifically is required.
The output format of OpenSSL::PKey::RSA#export depends on whether the
key is a public key or a private key, which is very counter-intuitive.
Additionally, when called with arguments to encrypt a private key, as in
this example, OpenSSL's own, non-standard format is used. The man page
of PEM_write_bio_PrivateKey_traditional(3) in OpenSSL 1.1.1 or later
states that it "should only be used for compatibility with legacy
programs".
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