[MINOR][DOCS] Update build descriptions and commands

## What changes were proposed in this pull request?

This PR updates Scala and Hadoop versions in the build description and commands in `Building Spark` documents.

## How was this patch tested?

N/A

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #11838 from dongjoon-hyun/fix_doc_building_spark.

docs/building-spark.md

@@ -98,8 +98,11 @@ mvn -Pyarn -Phadoop-2.3 -Dhadoop.version=2.3.0 -DskipTests clean package
 # Apache Hadoop 2.4.X or 2.5.X
 mvn -Pyarn -Phadoop-2.4 -Dhadoop.version=VERSION -DskipTests clean package
 
-Versions of Hadoop after 2.5.X may or may not work with the -Phadoop-2.4 profile (they were
-released after this version of Spark).
+# Apache Hadoop 2.6.X
+mvn -Pyarn -Phadoop-2.6 -Dhadoop.version=2.6.0 -DskipTests clean package
+
+# Apache Hadoop 2.7.X and later
+mvn -Pyarn -Phadoop-2.7 -Dhadoop.version=VERSION -DskipTests clean package
 
 # Different versions of HDFS and YARN.
 mvn -Pyarn -Phadoop-2.3 -Dhadoop.version=2.3.0 -Dyarn.version=2.2.0 -DskipTests clean package
@@ -140,10 +143,10 @@ It's possible to build Spark sub-modules using the `mvn -pl` option.
 For instance, you can build the Spark Streaming module using:
 
 {% highlight bash %}
-mvn -pl :spark-streaming_2.10 clean install
+mvn -pl :spark-streaming_2.11 clean install
 {% endhighlight %}
 
-where `spark-streaming_2.10` is the `artifactId` as defined in `streaming/pom.xml` file.
+where `spark-streaming_2.11` is the `artifactId` as defined in `streaming/pom.xml` file.
 
 # Continuous Compilation
 

docs/index.md

@@ -130,8 +130,8 @@ options for deployment:
 * [StackOverflow tag `apache-spark`](http://stackoverflow.com/questions/tagged/apache-spark)
 * [Mailing Lists](http://spark.apache.org/mailing-lists.html): ask questions about Spark here
 * [AMP Camps](http://ampcamp.berkeley.edu/): a series of training camps at UC Berkeley that featured talks and
-  exercises about Spark, Spark Streaming, Mesos, and more. [Videos](http://ampcamp.berkeley.edu/3/),
-  [slides](http://ampcamp.berkeley.edu/3/) and [exercises](http://ampcamp.berkeley.edu/3/exercises/) are
+  exercises about Spark, Spark Streaming, Mesos, and more. [Videos](http://ampcamp.berkeley.edu/6/),
+  [slides](http://ampcamp.berkeley.edu/6/) and [exercises](http://ampcamp.berkeley.edu/6/exercises/) are
   available online for free.
 * [Code Examples](http://spark.apache.org/examples.html): more are also available in the `examples` subfolder of Spark ([Scala]({{site.SPARK_GITHUB_URL}}/tree/master/examples/src/main/scala/org/apache/spark/examples),
  [Java]({{site.SPARK_GITHUB_URL}}/tree/master/examples/src/main/java/org/apache/spark/examples),

docs/running-on-mesos.md

@@ -167,8 +167,8 @@ For example:
 ./bin/spark-submit \
   --class org.apache.spark.examples.SparkPi \
   --master mesos://207.184.161.138:7077 \
-  --deploy-mode cluster
-  --supervise
+  --deploy-mode cluster \
+  --supervise \
   --executor-memory 20G \
   --total-executor-cores 100 \
   http://path/to/examples.jar \

docs/running-on-yarn.md

@@ -49,8 +49,8 @@ In `cluster` mode, the driver runs on a different machine than the client, so `S
     $ ./bin/spark-submit --class my.main.Class \
         --master yarn \
         --deploy-mode cluster \
-        --jars my-other-jar.jar,my-other-other-jar.jar
-        my-main-jar.jar
+        --jars my-other-jar.jar,my-other-other-jar.jar \
+        my-main-jar.jar \
         app_arg1 app_arg2