[MINOR][ML] Fix comments in LSH Examples and Python API

## What changes were proposed in this pull request?
Remove `org.apache.spark.examples.` in
Add slash in one of the python doc.

## How was this patch tested?
Run examples using the commands in the comments.

Author: Yun Ni <yunn@uber.com>

Closes #17104 from Yunni/yunn_minor.

Author: Yun Ni

examples/src/main/java/org/apache/spark/examples/ml/JavaBucketedRandomProjectionLSHExample.java

@@ -42,7 +42,7 @@
 /**
  * An example demonstrating BucketedRandomProjectionLSH.
  * Run with:
- *   bin/run-example org.apache.spark.examples.ml.JavaBucketedRandomProjectionLSHExample
+ *   bin/run-example ml.JavaBucketedRandomProjectionLSHExample
  */
 public class JavaBucketedRandomProjectionLSHExample {
   public static void main(String[] args) {

examples/src/main/java/org/apache/spark/examples/ml/JavaMinHashLSHExample.java

@@ -42,7 +42,7 @@
 /**
  * An example demonstrating MinHashLSH.
  * Run with:
- *   bin/run-example org.apache.spark.examples.ml.JavaMinHashLSHExample
+ *   bin/run-example ml.JavaMinHashLSHExample
  */
 public class JavaMinHashLSHExample {
   public static void main(String[] args) {

examples/src/main/scala/org/apache/spark/examples/ml/BucketedRandomProjectionLSHExample.scala

@@ -28,7 +28,7 @@ import org.apache.spark.sql.SparkSession
 /**
  * An example demonstrating BucketedRandomProjectionLSH.
  * Run with:
- *   bin/run-example org.apache.spark.examples.ml.BucketedRandomProjectionLSHExample
+ *   bin/run-example ml.BucketedRandomProjectionLSHExample
  */
 object BucketedRandomProjectionLSHExample {
   def main(args: Array[String]): Unit = {

examples/src/main/scala/org/apache/spark/examples/ml/MinHashLSHExample.scala

@@ -28,7 +28,7 @@ import org.apache.spark.sql.SparkSession
 /**
  * An example demonstrating MinHashLSH.
  * Run with:
- *   bin/run-example org.apache.spark.examples.ml.MinHashLSHExample
+ *   bin/run-example ml.MinHashLSHExample
  */
 object MinHashLSHExample {
   def main(args: Array[String]): Unit = {

python/pyspark/ml/feature.py

@@ -258,7 +258,7 @@ class BucketedRandomProjectionLSH(JavaEstimator, LSHParams, HasInputCol, HasOutp
     def __init__(self, inputCol=None, outputCol=None, seed=None, numHashTables=1,
                  bucketLength=None):
         """
-        __init__(self, inputCol=None, outputCol=None, seed=None, numHashTables=1,
+        __init__(self, inputCol=None, outputCol=None, seed=None, numHashTables=1, \
                  bucketLength=None)
         """
         super(BucketedRandomProjectionLSH, self).__init__()