SPARK-7265 minor fix of the content

Author: JihongMA

docs/sql-programming-guide.md

@@ -1259,9 +1259,9 @@ on all of the worker nodes, as they will need access to the Hive serialization a
 (SerDes) in order to access data stored in Hive.
 
 Configuration of Hive is done by placing your `hive-site.xml` file in `conf/`. Please note when running 
-the query on Yarn cluster (`yarn-cluster` mode),the `datanucleus` jars under `lib_managed/jars` directory 
+the query on YARN cluster (`yarn-cluster` mode),the `datanucleus` jars under `lib_managed/jars` directory 
 and `hive-site.xml` under `conf/` directory need to be available on driver and all executors launched by
-Yarn cluster. The convenient way to do this is adding them through `--jars` option and `--file` option of
+YARN cluster. The convenient way to do this is adding them through `--jars` option and `--file` option of
 spark-submit command.