docs: update advanced guide details (openai#5395)

Author: tibo-openai

docs/advanced.md

@@ -10,7 +10,7 @@ Most day-to-day tuning lives in `config.toml`: set approval + sandbox presets, p
 
 Because Codex is written in Rust, it honors the `RUST_LOG` environment variable to configure its logging behavior.
 
-The TUI defaults to `RUST_LOG=codex_core=info,codex_tui=info` and log messages are written to `~/.codex/log/codex-tui.log`, so you can leave the following running in a separate terminal to monitor log messages as they are written:
+The TUI defaults to `RUST_LOG=codex_core=info,codex_tui=info,codex_rmcp_client=info` and log messages are written to `~/.codex/log/codex-tui.log`, so you can leave the following running in a separate terminal to monitor log messages as they are written:
 
 ```
 tail -F ~/.codex/log/codex-tui.log
@@ -22,7 +22,7 @@ See the Rust documentation on [`RUST_LOG`](https://docs.rs/env_logger/latest/env
 
 ## Model Context Protocol (MCP) {#model-context-protocol}
 
-The Codex CLI and IDE extension is a MCP client which means that it can be configured to connect to MCP servers. For more information, refer to the [`config docs`](./config.md#connecting-to-mcp-servers).
+The Codex CLI and IDE extension is a MCP client which means that it can be configured to connect to MCP servers. For more information, refer to the [`config docs`](./config.md#mcp-integration).
 
 ## Using Codex as an MCP Server {#mcp-server}
 
@@ -43,7 +43,7 @@ Send a `tools/list` request and you will see that there are two tools available:
 | Property                | Type   | Description                                                                                                                                            |
 | ----------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------ | --- |
 | **`prompt`** (required) | string | The initial user prompt to start the Codex conversation.                                                                                               |
-| `approval-policy`       | string | Approval policy for shell commands generated by the model: `untrusted`, `on-failure`, `never`.                                                         |
+| `approval-policy`       | string | Approval policy for shell commands generated by the model: `untrusted`, `on-failure`, `on-request`, `never`.                                           |
 | `base-instructions`     | string | The set of instructions to use instead of the default ones.                                                                                            |
 | `config`                | object | Individual [config settings](https://github.com/openai/codex/blob/main/docs/config.md#config) that will override what is in `$CODEX_HOME/config.toml`. |
 | `cwd`                   | string | Working directory for the session. If relative, resolved against the server process's current directory.                                               |     |