Mark private members as static part 8 (#14233)

https://docs.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1822

src/System.Management.Automation/engine/remoting/common/WireDataFormat/RemoteHost.cs

@@ -198,7 +198,7 @@ namespace System.Management.Automation.Remoting
         /// <summary>
         /// Get remote runspace to close.
         /// </summary>
-        private RemoteRunspace GetRemoteRunspaceToClose(PSHost clientHost)
+        private static RemoteRunspace GetRemoteRunspaceToClose(PSHost clientHost)
         {
             // Figure out if we need to close the remote runspace. Return null if we don't.
 
@@ -440,7 +440,7 @@ namespace System.Management.Automation.Remoting
         /// </summary>
         /// <param name="caption">Caption to modify.</param>
         /// <returns>New modified caption.</returns>
-        private string ModifyCaption(string caption)
+        private static string ModifyCaption(string caption)
         {
             string pscaption = CredUI.PromptForCredential_DefaultCaption;
 
@@ -465,7 +465,7 @@ namespace System.Management.Automation.Remoting
         /// <param name="computerName">computername to include in the
         /// message</param>
         /// <returns>Message which contains a warning as well.</returns>
-        private string ModifyMessage(string message, string computerName)
+        private static string ModifyMessage(string message, string computerName)
         {
             string modifiedMessage = PSRemotingErrorInvariants.FormatResourceString(
                     RemotingErrorIdStrings.RemoteHostPromptForCredentialModifiedMessage,
@@ -485,7 +485,7 @@ namespace System.Management.Automation.Remoting
         /// <param name="resourceString">Resource string to use.</param>
         /// <returns>A constructed remote host call message
         /// which will display the warning.</returns>
-        private RemoteHostCall ConstructWarningMessageForSecureString(string computerName,
+        private static RemoteHostCall ConstructWarningMessageForSecureString(string computerName,
             string resourceString)
         {
             string warning = PSRemotingErrorInvariants.FormatResourceString(
@@ -506,7 +506,7 @@ namespace System.Management.Automation.Remoting
         /// in warning</param>
         /// <returns>A constructed remote host call message
         /// which will display the warning.</returns>
-        private RemoteHostCall ConstructWarningMessageForGetBufferContents(string computerName)
+        private static RemoteHostCall ConstructWarningMessageForGetBufferContents(string computerName)
         {
             string warning = PSRemotingErrorInvariants.FormatResourceString(
                 RemotingErrorIdStrings.RemoteHostGetBufferContents,