Update labs flag description for RTE

src/i18n/strings/en_EN.json

@@ -934,7 +934,7 @@
     "Keep discussions organised with threads.": "Keep discussions organised with threads.",
     "Threads help keep conversations on-topic and easy to track. <a>Learn more</a>.": "Threads help keep conversations on-topic and easy to track. <a>Learn more</a>.",
     "Rich text editor": "Rich text editor",
-    "Use rich text instead of Markdown in the message composer. Plain text mode coming soon.": "Use rich text instead of Markdown in the message composer. Plain text mode coming soon.",
+    "Use rich text instead of Markdown in the message composer.": "Use rich text instead of Markdown in the message composer.",
     "Render simple counters in room header": "Render simple counters in room header",
     "New ways to ignore people": "New ways to ignore people",
     "Currently experimental.": "Currently experimental.",

src/settings/Settings.tsx

@@ -291,7 +291,7 @@ export const SETTINGS: { [setting: string]: ISetting } = {
         isFeature: true,
         labsGroup: LabGroup.Messaging,
         displayName: _td("Rich text editor"),
-        description: _td("Use rich text instead of Markdown in the message composer. Plain text mode coming soon."),
+        description: _td("Use rich text instead of Markdown in the message composer."),
         supportedLevels: LEVELS_FEATURE,
         default: false,
     },