a couple of comments to clarify the format of CORS headers

server/tinode.conf

@@ -72,7 +72,8 @@
 				// File system location to store uploaded files. In case of a cluster it
 				// must be accessible by all cluster members, i.e. a network drive like https://www.samba.org/
 				"upload_dir": "uploads",
-				// Origin URLs allowed to download/upload files. Not necessary in most cases.
+				// Origin URLs allowed to download/upload files, e.g. ["https://www.example.com", "http://example.com"].
+				// Not necessary in most cases.
 				// "cors_origins": ["*"]
 			},
 			// Amazon AWS S3 storage.
@@ -85,8 +86,8 @@
 				"region": "s3 region, like us-east-2",
 				// Name of the S3 bucket.
 				"bucket": "your_s3_bucket_name",
-				// Origin URLs allowed to download files. See
-				// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin
+				// Origin URLs allowed to download files, e.g. ["https://www.example.com", "http://example.com"].
+				// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin
 				"cors_origins": ["*"]
 			}
 		}