Fix: fix chart in secure comms update doc

[Guaris]

Added a row for clarity.

Now looks like:

| Certificate | Type         | Issuer                   |
|-------------|--------------|--------------------------|
| `cert1`     | Service      | Issued by Intermediary   |
| `cert2`     | Intermediary | Issued by Root           |
| `cert3`     | Root         | Issued by Root (Self-signed) |

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