[SPARK-11549][Docs] Replace example code in mllib-evaluation-metrics.md using include_example

[vikasnp]

No description provided.

[yinxusen]

We'd better making these class names more concretely. I.e. JavaBinaryClassificatinMetricsExample. And the same for the following classes.

[yinxusen]

add a space line

[vikasnp]

@yinxusen Thanks for patiently pointing out the issues. I've fixed them. Please test it.

[SparkQA]

Test build #46322 has finished for PR 9689 at commit 1c5cc8f.

• This patch fails Python style tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):\n * public class JavaBinaryClassificationMetricsExample\n * public class JavaMultiLabelClassificationMetricsExample\n * public class JavaMulticlassClassificationMetricsExample\n * SparkConf conf = new SparkConf().setAppName(\"Multi class Classification Metrics Example\");\n * public class JavaRankingMetricsExample\n * public class JavaRegressionMetricsExample\n

[yinxusen]

remove it, there are two $example on$

[yinxusen]

@mengxr LGTM except for some minor issues.

[vikasnp]

@yinxusen @mengxr Style tests passed this time. I've removed those extra lines

[SparkQA]

Test build #46324 has finished for PR 9689 at commit 88512e7.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):\n * public class JavaBinaryClassificationMetricsExample\n * public class JavaMultiLabelClassificationMetricsExample\n * public class JavaMulticlassClassificationMetricsExample\n * SparkConf conf = new SparkConf().setAppName(\"Multi class Classification Metrics Example\");\n * public class JavaRankingMetricsExample\n * public class JavaRegressionMetricsExample\n

[vikasnp]

@yinxusen @mengxr Can we merge this, if there aren't any further issues?

[mengxr]

Merged into master and branch-1.6. Thanks!