[DOCS] Fix minor wrong lambda expression example.

[sarutak]

It's a really minor issue but there is an example with wrong lambda-expression usage in SQLContext.scala like as follows.

sqlContext.udf().register("myUDF",
       (Integer arg1, String arg2) -> arg2 + arg1),  <- We have an extra `)` here.
       DataTypes.StringType);

[SparkQA]

Test build #36383 has finished for PR 7187 at commit a13196d.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[sarutak]

retest this please.

[srowen]

LGTM. Unrelated failure but let's do it again

[SparkQA]

Test build #36386 has finished for PR 7187 at commit a13196d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #994 has finished for PR 7187 at commit a13196d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • case class Heartbeat(workerId: String, worker: RpcEndpointRef) extends DeployMessage
  • case class RegisteredWorker(master: RpcEndpointRef, masterWebUiUrl: String) extends DeployMessage
  • case class RegisterApplication(appDescription: ApplicationDescription, driver: RpcEndpointRef)
  • case class RegisteredApplication(appId: String, master: RpcEndpointRef) extends DeployMessage
  • case class SubmitDriverResponse(
  • case class KillDriverResponse(
  • case class MasterChanged(master: RpcEndpointRef, masterWebUiUrl: String)
  • class DCT(override val uid: String)
  • class MinMaxScaler(override val uid: String)
  • class PCA (override val uid: String) extends Estimator[PCAModel] with PCAParams
  • class StreamingLinearAlgorithm(object):
  • class StreamingLinearRegressionWithSGD(StreamingLinearAlgorithm):
  • class AnalysisException(Exception):
  • class FlumeUtils(object):
  • case class Cast(child: Expression, dataType: DataType) extends UnaryExpression with Logging
  • trait ExpectsInputTypes
  • trait AutoCastInputTypes
  • abstract class BinaryExpression extends Expression with trees.BinaryNode[Expression]
  • abstract class BinaryOperator extends BinaryExpression
  • trait ExtractValue
  • abstract class ExtractValueWithStruct extends UnaryExpression with ExtractValue
  • abstract class ExtractValueWithOrdinal extends BinaryExpression with ExtractValue
  • abstract class BinaryArithmetic extends BinaryOperator
  • class SpecificOrdering extends $
  • class SpecificProjection extends $
  • final class SpecificRow extends $
  • case class UnHex(child: Expression) extends UnaryExpression with Serializable
  • case class Crc32(child: Expression)
  • abstract class BinaryComparison extends BinaryOperator with Predicate
  • // compiled class file for the closure here will conflict with the one in callUDF (upper case).

[sarutak]

Merging into master and branch-1.4.