Fix RCS1139: Add summary element to documentation comment (#14442)

https://github.com/JosefPihrt/Roslynator/blob/master/docs/analyzers/RCS1139.md

src/Microsoft.PowerShell.Commands.Diagnostics/GetCounterCommand.cs

@@ -16,9 +16,9 @@ using Microsoft.PowerShell.Commands.GetCounter;
 
 namespace Microsoft.PowerShell.Commands
 {
-    ///
+    /// <summary>
     /// Class that implements the Get-Counter cmdlet.
-    ///
+    /// </summary>
     [Cmdlet(VerbsCommon.Get, "Counter", DefaultParameterSetName = "GetCounterSet", HelpUri = "https://go.microsoft.com/fwlink/?LinkID=2109647")]
     public sealed class GetCounterCommand : PSCmdlet
     {

src/Microsoft.PowerShell.Commands.Diagnostics/GetEventCommand.cs

@@ -20,9 +20,9 @@ using System.Xml;
 
 namespace Microsoft.PowerShell.Commands
 {
-    ///
+    /// <summary>
     /// Class that implements the Get-WinEvent cmdlet.
-    ///
+    /// </summary>
     [Cmdlet(VerbsCommon.Get, "WinEvent", DefaultParameterSetName = "GetLogSet", HelpUri = "https://go.microsoft.com/fwlink/?LinkID=2096581")]
     public sealed class GetWinEventCommand : PSCmdlet
     {

src/Microsoft.PowerShell.Commands.Diagnostics/NewWinEventCommand.cs

@@ -14,10 +14,10 @@ using System.Xml;
 
 namespace Microsoft.PowerShell.Commands
 {
-    ///
+    /// <summary>
     /// Class that implements the New-WinEvent cmdlet.
     /// This cmdlet writes a new Etw event using the provider specified in parameter.
-    ///
+    /// </summary>
     [Cmdlet(VerbsCommon.New, "WinEvent", HelpUri = "https://go.microsoft.com/fwlink/?LinkID=2096808")]
     public sealed class NewWinEventCommand : PSCmdlet
     {