Roll Dart Documentation Generator from d4c344d41ee3 to c22e5e77de29 (2 revisions)

https://dart.googlesource.com/dartdoc/+log/d4c344d41ee3..c22e5e77de29

2022-09-23 parlough@gmail.com Fix slash focusing search (#3183)
2022-09-22 andre.lipke@gmail.com Add GitHub light/dark mode image syntax (#3182)

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: Ie7984593db0611b219e32734fa4aceacdd42d150
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/260781
Reviewed-by: Kevin Moore <kevmoo@google.com>
Commit-Queue: Kevin Moore <kevmoo@google.com>

DEPS

@@ -108,7 +108,7 @@ vars = {
   # For more details, see https://github.com/dart-lang/sdk/issues/30164.
   "dart_style_rev": "49bc3ff32b5578b6e19f8fd376d668130941ee29", # manually rev'd
 
-  "dartdoc_rev": "d4c344d41ee332733dfa7e2d093dc7df3f481923",
+  "dartdoc_rev": "c22e5e77de29bb9d334315926da5fdc0a218f3d4",
   "devtools_rev": "40aae5e5ea2118e2b6dee8a8a20f166f7cec4270",
   "ffi_rev": "fb5f2667826c0900e551d19101052f84e35f41bf",
   "file_rev": "b2e31cb6ef40b223701dbfa0b907fe58468484d7",