Update dartdoc to 0.35.0 (#67432)

dartdoc_options.yaml

@@ -28,6 +28,7 @@ dartdoc:
     - ignored-canonical-for
     - missing-from-search-index
     - no-canonical-found
+    - no-documentable-libraries
     - no-library-level-docs
     - not-implemented
     - orphaned-file

dev/bots/docs.sh

@@ -39,7 +39,7 @@ function generate_docs() {
     # Install and activate dartdoc.
     # NOTE: When updating to a new dartdoc version, please also update
     # `dartdoc_options.yaml` to include newly introduced error and warning types.
-    "$PUB" global activate dartdoc 0.34.0
+    "$PUB" global activate dartdoc 0.35.0
 
     # This script generates a unified doc set, and creates
     # a custom index.html, placing everything into dev/docs/doc.

dev/docs/dartdoc_options.yaml

+dartdoc:
+  ignore:
+    # The stub `Flutter` package is expected to have no
+    # documentable libraries.
+    - no-documentable-libraries