It's all in the details, from man-pages(7):
Formatting conventions for manual pages describing functions
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Variable names should, like argument names, be specified in italics.
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Formatting conventions (general)
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Special macros, which are usually in uppercase, are in bold.
Exception: don't boldface NULL.
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Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10034)
The EVP_KDF_ctrl function doesn't exist anymore and have been replaced by
EVP_KDF_CTX_set_params.
The EVP_KDF_new_id function doesn't exist either and EVP_KDF_new should be
used instead.
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9905)
All of the examples called EVP_KDF_set_params() when they should have been
calling EVP_KDF_CTX_set_params().
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9898)
