Shorten settings verbiage. (#5131)

packages/extensionmanager-extension/schema/plugin.json

@@ -7,7 +7,7 @@
     "enabled": {
       "title": "Enabled Status",
       "description":
-        "Enables the extension manager (requires Node.js/npm, so disabled by default). WARNING: installing untrusted extensions can introduce security issues.",
+        "Enables extension manager (requires Node.js/npm).\nWARNING: installing untrusted extensions may be unsafe.",
       "default": false,
       "type": "boolean"
     }