DOCS: add openssl-core_names.h(7)

A CAVEATS section is present in this manual. That section name is
borrowed from OpenBSD, where mdoc(7) explains it like this:

CAVEATS

DOCS: add openssl-core_names.h(7)

A CAVEATS section is present in this manual. That section name is
borrowed from OpenBSD, where mdoc(7) explains it like this:

CAVEATS
Common misuses and misunderstandings should be explained in this
section.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11963)

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