Fix wrong Package desciption text

Kyle-Ye · Kyle-Ye · commit ea57325228d1 · 2021-12-07T01:06:11.000+08:00
diff --git a/Package.swift b/Package.swift
@@ -1,4 +1,6 @@
 // swift-tools-version:5.3
+// In order to support users running on the latest Xcodes, please ensure that
+// Package@swift-5.5.swift is kept in sync with this file.
 /*
  This source file is part of the Swift.org open source project
 
diff --git a/Package@swift-5.5.swift b/Package@swift-5.5.swift
@@ -1,6 +1,6 @@
 // swift-tools-version:5.5
-// In order to support users running on the latest Xcodes, please ensure that
-// Package@swift-5.5.swift is kept in sync with this file.
+// In order to support users running on legacy Xcodes, please ensure that
+// Package.swift is kept in sync with this file.
 /*
  This source file is part of the Swift.org open source project
 
