Fix comment

Signed-off-by: mornyx <mornyx.z@gmail.com>

tikvrpc/interceptor/interceptor.go

@@ -56,12 +56,12 @@ import (
 //     }
 // }
 // txn.SetRPCInterceptor(GetLogInterceptor())
+// ```
 //
 // NOTE: Interceptor calls may not correspond one-to-one with the underlying gRPC requests.
 // This is because there may be some exceptions, such as: request collapsed, request batched,
 // no valid connection etc. If you have questions about the execution location of RPCInterceptor,
 // please refer to: internal/client/client_collapse.go#SendRequest.
-// ```
 type RPCInterceptor func(next RPCInterceptorFunc) RPCInterceptorFunc
 
 // RPCInterceptorFunc is a callable function used to initiate a request to TiKV.