revise wordings for powershell generator

Author: wing328

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PowerShellClientCodegen.java

@@ -153,7 +153,7 @@ public PowerShellClientCodegen() {
         cliOptions.clear();
         cliOptions.add(new CliOption(CodegenConstants.PACKAGE_NAME, "Client package name (e.g. io.swagger.client).").defaultValue(this.packageName));
         cliOptions.add(new CliOption(CodegenConstants.OPTIONAL_PROJECT_GUID, "GUID for PowerShell module (e.g. a27b908d-2a20-467f-bc32-af6f3a654ac5). A random GUID will be generated by default."));
-        cliOptions.add(new CliOption("csharpClientPath", "Path to the C# API client generated by Swagger Codegen, e.g. $ScriptDir\\..\\csharp\\SwaggerClient where $ScriptDir is the current directory.").defaultValue(this.csharpClientPath));
+        cliOptions.add(new CliOption("csharpClientPath", "Path to the C# API client generated by Swagger Codegen, e.g. $ScriptDir\\..\\csharp\\SwaggerClient where $ScriptDir is the current directory. NOTE: you will need to generate the C# API client separately.").defaultValue(this.csharpClientPath));
 
     }
 
@@ -166,7 +166,7 @@ public String getName() {
     }
 
     public String getHelp() {
-        return "Generates a PowerShell API client (beta).";
+        return "Generates a PowerShell API client (beta). (The dependency C# API client needs to be generated separately.";
     }
 
     public void setPackageName(String packageName) {