update labels

Author: kevmoo

static/sdk_labels.json

@@ -234,7 +234,6 @@
  "linter-false-negative",
  "linter-false-positive",
  "linter-lint-proposal",
- "linter-lint-request",
  "linter-new-language-feature",
  "linter-set-core",
  "linter-set-flutter",
@@ -246,6 +245,7 @@
  "model-build-integration",
  "model-const-eval",
  "model-crashes",
+ "model-dartdoc",
  "model-discrepancy",
  "model-error-recovery",
  "model-exhaustiveness",