Samples, Github template: Fixed small typos.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -24,7 +24,7 @@ A clear and concise description of what the bug is.
 <!-- Remove the items which don't apply from the following list. -->
 - Client
 - ManagedClient
-- RcpClient
+- RpcClient
 - Server
 
 ### To Reproduce

Samples/RpcClient/RcpClient_Samples.cs → Samples/RpcClient/RpcClient_Samples.cs

@@ -8,7 +8,7 @@ using MQTTnet.Protocol;
 
 namespace MQTTnet.Samples.RpcClient;
 
-public static class RcpClient_Samples
+public static class RpcClient_Samples
 {
     /*
      * The extension MQTTnet.Extensions.Rpc (available as nuget) allows sending a request and waiting for the matching reply.