Fix minor spelling mistake in readme (#4818)

Author: tristansokol

modules/swagger-codegen/src/main/resources/csharp/README.mustache

@@ -31,7 +31,7 @@ This C# SDK is automatically generated by the [Swagger Codegen](https://github.c
 - [RestSharp](https://www.nuget.org/packages/RestSharp) - 105.1.0 or later
 - [Json.NET](https://www.nuget.org/packages/Newtonsoft.Json/) - 7.0.0 or later
 
-The DLLs included in the package may not be the latest version. We recommned using [NuGet] (https://docs.nuget.org/consume/installing-nuget) to obtain the latest version of the packages:
+The DLLs included in the package may not be the latest version. We recommend using [NuGet] (https://docs.nuget.org/consume/installing-nuget) to obtain the latest version of the packages:
 ```
 Install-Package RestSharp
 Install-Package Newtonsoft.Json