[hotfix] [docs] Fix log file name in quick start guide

Program output is written to TaskManager logs.

This closes apache#4641

docs/quickstart/setup_quickstart.md

@@ -269,7 +269,7 @@ window of processing time, as long as words are floating in.
  </div>
 
 * Words are counted in time windows of 5 seconds (processing time, tumbling
- windows) and are printed to `stdout`. Monitor the JobManager's output file
+ windows) and are printed to `stdout`. Monitor the TaskManager's output file
  and write some text in `nc` (input is sent to Flink line by line after
  hitting <RETURN>):
 
@@ -284,7 +284,7 @@ window of processing time, as long as words are floating in.
  as words are floating in, e.g.:
 
  ~~~bash
- $ tail -f log/flink-*-jobmanager-*.out
+ $ tail -f log/flink-*-taskmanager-*.out
  lorem : 1
  bye : 1
  ipsum : 4