Apply suggestions from code review

Author: andyleejordan

src/PowerShellEditorServices/Utility/ArgumentUtils.cs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
 using System.Text;
 using System.Management.Automation.Language;
 
@@ -6,11 +9,11 @@ namespace Microsoft.PowerShell.EditorServices.Utility
     internal static class ArgumentEscaping
     {
         /// <summary>
-        /// Escape a powershell argument while still making it evaluatable in AddScript.
+        /// Escape a PowerShell argument while still making it able to be evaluated in AddScript.
         ///
-        /// NOTE: This does not "santize" parameters, e.g. a pipe in one argument might affect another argument.
+        /// NOTE: This does not "sanitize" parameters, e.g., a pipe in one argument might affect another argument.
         /// This is intentional to give flexibility to specifying arguments.
-        /// It also does not try to fix invalid PowerShell syntax, e.g. a single quote in a string literal.
+        /// It also does not try to fix invalid PowerShell syntax, e.g., a single quote in a string literal.
         /// </summary>
         public static string Escape(string Arg)
         {

test/PowerShellEditorServices.Test/Utility/ArgumentEscapingTests.cs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
 using Xunit;
 using Microsoft.PowerShell.EditorServices.Utility;
 using System.IO;