Addressed Arira's comment on upgrader message.

ScriptableRenderPipeline/Core/Editor/MaterialUpgrader.cs

 
         string m_OldShader;
         string m_NewShader;
+        private static readonly string projectBackMessage = "Make sure to have a project backup before proceeding.";
         MaterialFinalizer m_Finalizer;
 
         Dictionary<string, string> m_TextureRename = new Dictionary<string, string>();
 
         public static void UpgradeProjectFolder(List<MaterialUpgrader> upgraders, string progressBarName, UpgradeFlags flags = UpgradeFlags.None)
         {
-            if (!EditorUtility.DisplayDialog("Material Upgrader", "The upgrade will overwrite material settings in your project." +
-                    "Be sure to have a project backup before proceeding", "Proceed", "Cancel"))
+            if (!EditorUtility.DisplayDialog("Material Upgrader", "The upgrade will overwrite materials in your project. " + projectBackMessage, "Proceed", "Cancel"))
                 return;
 
             int totalMaterialCount = 0;
         public static void UpgradeSelection(List<MaterialUpgrader> upgraders, string progressBarName, UpgradeFlags flags = UpgradeFlags.None)
         {
             var selection = Selection.objects;
-            if (!EditorUtility.DisplayDialog("Material Upgrader", string.Format("The upgrade will possibly overwrite all the {0} selected material settings", selection.Length) +
-                    "Be sure to have a project backup before proceeding", "Proceed", "Cancel"))
+            if (!EditorUtility.DisplayDialog("Material Upgrader", string.Format("The upgrade will overwrite {0} selected material{1}. ", selection.Length, (selection.Length > 1) ? "s" : "") +
+                    projectBackMessage, "Proceed", "Cancel"))
                 return;
 
             string lastMaterialName = "";