[Spark-1234] clean up text in running-on-yarn.md yarn-client section#130

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dianacarroll wants to merge 3 commits intoapache:masterfrom

dianacarroll:spark-1234

Commits on Feb 27, 2014

SPARK-1134 bug with ipython prevents non-interactive use with spark; only call ipython if no command line arguments were supplied
Diana Carroll
committed

Commits on Mar 12, 2014

Cleaned up text of yarn-client instructions. [SPARK-1234]

Diana Carroll
authored and
training
committed

Commits on Mar 20, 2014

fix typo in running-on-yarn default SPARK_MASTER_MEMORY values
Diana Carroll
committed