Update spark-dotnet.md

Removed DotNetRunner: null / Futures timeout in Synapse Spark Job Definition Run Synapse Spark Job Definitions on Spark Pools using Spark 2.4 require Microsoft.Spark 1.0.0. Clear your bin and obj directories, and publish the project using 1.0.0.

Author: jeacla

articles/synapse-analytics/spark/spark-dotnet.md

@@ -115,10 +115,6 @@ The following features are available when you use .NET for Apache Spark in the A
 
 ## Troubleshooting
 
-### `DotNetRunner: null` / `Futures timeout` in Synapse Spark Job Definition Run
-
-Synapse Spark Job Definitions on Spark Pools using [Spark 2.4](./apache-spark-24-runtime.md) require `Microsoft.Spark` 1.0.0. Clear your `bin` and `obj` directories, and publish the project using 1.0.0.
-
 ### OutOfMemoryError: java heap space at org.apache.spark
 
 Dotnet Spark 1.0.0 uses a different debug architecture than 1.1.1+. You will have to use 1.0.0 for your published version and 1.1.1+ for local debugging.