docs(phonic): add forbidSpeechAfterToolCall to README config table

[detail-app]

The configuration table in plugins/phonic/README.md was missing the
new forbidSpeechAfterToolCall option introduced in commit 8137ce4.
The option allows specifying tool names after which Phonic should not
auto-generate a spoken reply, which is essential for handoff scenarios.

Without this documentation, developers using TaskGroup or similar
handoff patterns would not know about this configuration option and
would encounter unwanted auto-generated speech after tool calls that
are intended to hand off to another agent.

Introduced by commit 8137ce4 (@arunwpm-work, #1821)

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[devin-ai-integration]

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