make tooltip more explicit

Author: vkovec

Assets/com.unity.formats.fbx/Editor/Scripts/FbxExportSettings.cs

@@ -124,7 +124,7 @@ public override void OnInspectorGUI() {
 
             var repairMissingScripts = new GUIContent (
                                        "Run Component Updater",
-                                        "If an asset store or forum package was previously installed, then links to the FbxPrefab component will need updating.\n" +
+                                        "If FBX exporter version 1.3.0f1 or earlier was previously installed, then links to the FbxPrefab component will need updating.\n" +
                                         "Run this to update all FbxPrefab references in text serialized prefabs and scene files.");
 
             if (GUILayout.Button (repairMissingScripts)) {