update react_discussions_post ff text

flag=react_discussions_post
fixes VICE-1754

test plan:
- restart rails once you have this checked out
- visit feature flags page
- verify text matches jira specs

Change-Id: I52f2237444f9587af31aa62f9f45a467a9a4b014
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/269794
Product-Review: Katrina Hess <khess@instructure.com>
Product-Review: Allison Pittler <allison.pittler@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Rob Orton <rob@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>

config/feature_flags/vice_release_flags.yml

@@ -18,12 +18,12 @@ confetti_for_valid_links:
 react_discussions_post:
   state: hidden
   beta: true
-  display_name: Discussions Redesign
+  display_name: Discussions/Announcements Redesign
   description: |-
-    This feature enhances the Canvas experience within Discussions.
-    When this flag is enabled, early access to ongoing improvements
-    will be displayed automatically with every release.
-    For full details, please see the Discussions Redesign user group
+    This feature enhances the Canvas experience within Discussions and Announcements.
+    When this flag is enabled, early access to ongoing improvements will be
+    displayed automatically with every release. For full details,
+    please see the Discussions/Announcements Redesign user group 
     in the Canvas Community.
   applies_to: Course