[SPARK-6657] [PYSPARK] Fix doc warnings

[mengxr]

Fixed the following warnings in make clean html under python/docs:

/Users/meng/src/spark/python/pyspark/mllib/evaluation.py:docstring of pyspark.mllib.evaluation.RankingMetrics.ndcgAt:3: ERROR: Unexpected indentation.
/Users/meng/src/spark/python/pyspark/mllib/evaluation.py:docstring of pyspark.mllib.evaluation.RankingMetrics.ndcgAt:4: WARNING: Block quote ends without a blank line; unexpected unindent.
/Users/meng/src/spark/python/pyspark/mllib/fpm.py:docstring of pyspark.mllib.fpm.FPGrowth.train:3: ERROR: Unexpected indentation.
/Users/meng/src/spark/python/pyspark/mllib/fpm.py:docstring of pyspark.mllib.fpm.FPGrowth.train:4: WARNING: Block quote ends without a blank line; unexpected unindent.
/Users/meng/src/spark/python/pyspark/sql/__init__.py:docstring of pyspark.sql.DataFrame.replace:16: WARNING: Field list ends without a blank line; unexpected unindent.
/Users/meng/src/spark/python/pyspark/streaming/kafka.py:docstring of pyspark.streaming.kafka.KafkaUtils.createRDD:8: ERROR: Unexpected indentation.
/Users/meng/src/spark/python/pyspark/streaming/kafka.py:docstring of pyspark.streaming.kafka.KafkaUtils.createRDD:9: WARNING: Block quote ends without a blank line; unexpected unindent.

@davies

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Test build #32948 has started for PR 6221 at commit 606f9fa.

[SparkQA]

Test build #32948 has finished for PR 6221 at commit 606f9fa.

• This patch fails Python style tests.
• This patch merges cleanly.
• This patch adds no public classes.

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Test build #32950 has started for PR 6221 at commit e3f83fe.

[mengxr]

test this please

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[mengxr]

test this please

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[SparkQA]

Test build #32972 has started for PR 6221 at commit e3f83fe.

[SparkQA]

Test build #32972 has finished for PR 6221 at commit e3f83fe.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • public class JavaOneVsRestExample
  • head("OneVsRest Example: multiclass to binary reduction using OneVsRest")
  • class DataTypeSingleton(type):
  • class NullType(DataType):
  • class AtomicType(DataType):
  • class NumericType(AtomicType):
  • class IntegralType(NumericType):
  • class FractionalType(NumericType):
  • class StringType(AtomicType):
  • class BinaryType(AtomicType):
  • class BooleanType(AtomicType):
  • class DateType(AtomicType):
  • class TimestampType(AtomicType):
  • class DecimalType(FractionalType):
  • class DoubleType(FractionalType):
  • class FloatType(FractionalType):
  • class ByteType(IntegralType):
  • class IntegerType(IntegralType):
  • class LongType(IntegralType):
  • class ShortType(IntegralType):
  • class Column(object):
  • class GroupedData(object):

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[mengxr]

Merged into master and branch-1.4.