[SPARK-3722][Docs]minor improvement and fix in docs

https://issues.apache.org/jira/browse/SPARK-3722
I personally prefer not to include these low level specifics but if others find it useful though I'm ok with it.   I would rather see the wording changes though.  Something more like:

You can also use view the container log files directly in HDFS using the HDFS shell or API.  The directory where they are located can be found by looking at your YARN configs (`yarn.nodemanager.remote-app-log-dir` and `yarn.nodemanager.remote-app-log-dir-suffix)`.