Roll Dart Documentation Generator from c2f66ecf1a75 to b3856970e4ab (2 revisions)

https://dart.googlesource.com/dartdoc/+log/c2f66ecf1a75..b3856970e4ab

2022-10-10 srawlins@google.com Remove 300 font weights, for improvements in dark mode (#3213)
2022-10-07 devoncarew@gmail.com Update README.md (#3209)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-doc-dart-sdk
Please CC dart-ecosystem-gardener@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Dart Documentation Generator: https://github.com/dart-lang/dartdoc/issues
To file a bug in Dart SDK: https://github.com/dart-lang/sdk/issues

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: dart-ecosystem-gardener@grotations.appspotmail.com
Change-Id: I94b8a054e92d5d95cf89754ef65bd6158039e72f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/263480
Commit-Queue: Devon Carew <devoncarew@google.com>
Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: DEPS Autoroller <dart-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -119,7 +119,7 @@ vars = {
   # For more details, see https://github.com/dart-lang/sdk/issues/30164.
   "dart_style_rev": "f79a9828ad07e50d6e8352ac154cc16eb4d78d5c", # manually rev'd
 
-  "dartdoc_rev": "c2f66ecf1a75c2a73e7e083291493f14b575d1e4",
+  "dartdoc_rev": "b3856970e4abb695fecba9b38e88e69832469c2e",
   "devtools_rev": "b21cd59f1f6bb60cacd59ba39e376d2a50d82f74",
   "ffi_rev": "fb5f2667826c0900e551d19101052f84e35f41bf",
   "file_rev": "b2e31cb6ef40b223701dbfa0b907fe58468484d7",