build: rename _toc to toc (#229)

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Source-Link: googleapis/synthtool@99c93fe

packages/google-cloud-talent/synth.metadata

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/nodejs-talent.git",
- "sha": "f88dee774a29f24edf218d5a6c1c2602d2b26773"
+ "sha": "650c88f4f7125dc908a41a954d500413a3cf8830"
  }
  },
  {
@@ -19,7 +19,7 @@
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "21f1470ecd01424dc91c70f1a7c798e4e87d1eec"
+ "sha": "99c93fe09f8c1dca09dfc0301c8668e3a70dd796"
  }
  }
  ],