fix typos

docs/running-on-yarn.md

@@ -46,7 +46,7 @@ If you want to test out the YARN deployment mode, you can use the current Spark
 
 Most of the configs are the same for Spark on YARN as other deploys. See the Configuration page for more information on those.  These are configs that are specific to SPARK on YARN.
 
-* `SPARK_YARN_USER_ENV`, environment variables to add to the Spark processes launched on YARN. This can be a comma separated list of environment variables. ie SPARK_YARN_USER_ENV="JAVA_HOME=/jdk64,FOO=bar"
+* `SPARK_YARN_USER_ENV`, to add environment variables to the Spark processes launched on YARN. This can be a comma separated list of environment variables. ie SPARK_YARN_USER_ENV="JAVA_HOME=/jdk64,FOO=bar"
 
 # Launching Spark on YARN
 

yarn/src/main/scala/spark/deploy/yarn/Client.scala

@@ -243,7 +243,7 @@ class Client(conf: Configuration, args: ClientArguments) extends YarnClientImpl
     // Command for the ApplicationMaster
     var javaCommand = "java";
     val javaHome = System.getenv("JAVA_HOME")
-    if ((javaHome != null && !javaHome.isEmpty()) || env.isDefinedAt("JAVA_HOME")){
+    if ((javaHome != null && !javaHome.isEmpty()) || env.isDefinedAt("JAVA_HOME")) {
       javaCommand = Environment.JAVA_HOME.$() + "/bin/java"
     }