Enable Release notes in the Help App by default.

Launch bug: crbug/1095838

Change-Id: Ie781b8d65871e97cc42c3f61732a6d15d60c6ab2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336113Reviewed-by: Patti <patricialor@chromium.org>
Commit-Queue: Rachel Carpenter <carpenterr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794369}

chromeos/constants/chromeos_features.cc

@@ -250,7 +250,7 @@ const base::Feature kHelpAppFirstRun{"HelpAppFirstRun",
 
 // Enable the release notes functionality in the Help app.
 const base::Feature kHelpAppReleaseNotes{"HelpAppReleaseNotes",
-                                         base::FEATURE_DISABLED_BY_DEFAULT};
+                                         base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enable the search service integration in the Help app.
 const base::Feature kHelpAppSearchServiceIntegration{