[DOCUMENTATION] Fixed target JAR path

## What changes were proposed in this pull request?

Mentioned Scala version in the sbt configuration file is 2.11, so the path of the target JAR should be `/target/scala-2.11/simple-project_2.11-1.0.jar`

## How was this patch tested?

n/a

Author: prabs <prabsmails@gmail.com>
Author: Prabeesh K <prabsmails@gmail.com>

Closes #13554 from prabeesh/master.