## What changes were proposed in this pull request?
PySpark's Binarizer docstring had two issues:
1) The values did not need to be in the range [0, 1].
2) It can be used for binary classification prediction.
This change corrects both of these issues by making it consistent with Scala's docstring for Binarizer.
## How was this patch tested?
Not applicable because I only changed the docstring. But if I need to do any testing, let me know and I'll do it.
Please review http://spark.apache.org/contributing.html before opening a pull request.
Closes#23934 from brookewenig/binarizer-docs-fix.
Authored-by: Brooke Wenig <brookewenig@gmail.com>
Signed-off-by: Sean Owen <sean.owen@databricks.com>
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