ssl: Document TLS alerts in ssl_error messages

[essen]

Small improvement discussed in https://github.com/erlang/otp/issues/9051

[github-actions[bot]]

CT Test Results

    2 files     66 suites   47m 30s ⏱️   800 tests   755 ✅  45 💤 0 ❌ 3 778 runs  2 983 ✅ 795 💤 0 ❌

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// Erlang/OTP Github Action Bot

[IngelaAndin]

@essen It is ready for merge, I think it could be target for maint to improve the docs earlier that OTP-28.

[essen]

OK I will rebase.

[essen]

Done.