chore: clean up Node.js TOC for cloud-rad (#697)

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Source-Link: googleapis/synthtool@901ddd4
Source-Link: googleapis/synthtool@f96d3b4

packages/google-cloud-dialogflow/synth.metadata

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/nodejs-dialogflow.git",
- "sha": "05c386fe5a8c1f21f3d513a673affe79afad8cce"
+ "sha": "1a72b5cc181e433feb9acd4d4925a0106f15d689"
  }
  },
  {
@@ -19,7 +19,7 @@
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "5451633881133e5573cc271a18e73b18caca8b1b"
+ "sha": "901ddd44e9ef7887ee681b9183bbdea99437fdcc"
  }
  }
  ],