Update CommandLineConfigurationExtensions.xml (#4697)

Author: Rick-Anderson

xml/Microsoft.Extensions.Configuration/CommandLineConfigurationExtensions.xml

@@ -188,7 +188,7 @@
         <example>
               A simple console application that has two short and four alias switch mappings defined. 
               <code>
-                // dotnet run -k1=value1 -k2 value2 --alt3=value2 /alt4=value3 --alt5 value5 /alt6 value6
+                // dotnet run k1=value1 -k2 value2 --alt3=value2 /alt4=value3 --alt5 value5 /alt6 value6
 
                 using Microsoft.Extensions.Configuration;
                 using System;