SPARK-4506 [DOCS] Addendum: Update more docs to reflect that standalo…

…ne works in cluster mode

This is a trivial addendum to SPARK-4506, which was already resolved. noted by Asim Jalis in SPARK-4506.

Author: Sean Owen <sowen@cloudera.com>

Closes #4160 from srowen/SPARK-4506 and squashes the following commits:

5f5f7df [Sean Owen] Update more docs to reflect that standalone works in cluster mode

Conflicts:
	docs/submitting-applications.md

docs/submitting-applications.md

@@ -57,8 +57,8 @@ to the console. Thus, this mode is especially suitable for applications that inv
 
 Alternatively, if your application is submitted from a machine far from the worker machines (e.g.
 locally on your laptop), it is common to use `cluster` mode to minimize network latency between
-the drivers and the executors. Note that `cluster` mode is currently not supported for standalone
-clusters, Mesos clusters, or python applications.
+the drivers and the executors. Note that `cluster` mode is currently not supported for Mesos
+clusters or python applications.
 
 For Python applications, simply pass a `.py` file in the place of `<application-jar>` instead of a JAR,
 and add Python `.zip`, `.egg` or `.py` files to the search path with `--py-files`.