[SPARK-15608][ML][EXAMPLES][DOC] add examples and documents of ml.isotonic regression

## What changes were proposed in this pull request?

add ml doc for ml isotonic regression
add scala example for ml isotonic regression
add java example for ml isotonic regression
add python example for ml isotonic regression

modify scala example for mllib isotonic regression
modify java example for mllib isotonic regression
modify python example for mllib isotonic regression

add data/mllib/sample_isotonic_regression_libsvm_data.txt
delete data/mllib/sample_isotonic_regression_data.txt
## How was this patch tested?

N/A

Author: WeichenXu <WeichenXu123@outlook.com>

Closes #13381 from WeichenXu123/add_isotonic_regression_doc.

2 files changed, 100 insertions, 100 deletions

diff --git a/data/mllib/sample_isotonic_regression_data.txt b/data/mllib/sample_isotonic_regression_data.txt
deleted file mode 100644
index d257b509d4..0000000000
--- a/data/mllib/sample_isotonic_regression_data.txt
+++ /dev/null
@@ -1,100 +0,0 @@
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\ No newline at end of file
diff --git a/data/mllib/sample_isotonic_regression_libsvm_data.txt b/data/mllib/sample_isotonic_regression_libsvm_data.txt
new file mode 100644
index 0000000000..f39fe0269c
--- /dev/null
+++ b/data/mllib/sample_isotonic_regression_libsvm_data.txt
@@ -0,0 +1,100 @@
+0.24579296 1:0.01
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\ No newline at end of file