Simplify and clarify doc/internal/man7/deprecation.pod

doc/internal/man7/deprecation.pod was unclear in some areas, and
included general documentation that has no place there.

R

Simplify and clarify doc/internal/man7/deprecation.pod

doc/internal/man7/deprecation.pod was unclear in some areas, and
included general documentation that has no place there.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13240)

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