ssl: Document ssl option "signature_algs_cert"
ssl: Document ssl option "signature_algs_cert"

Add documentation to the ssl option "signature_algs_cert"
introduced by TLS 1.3. The client/server will send a
"signature_algorithms_cert" extension, if TLS 1.3 or later
is used.

Change-Id: I17d612f311a1deef7e29473c3998e7f99fa56f02

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