[SPARK-20980][DOCS] update doc to reflect multiLine change

## What changes were proposed in this pull request?

doc only change

## How was this patch tested?

manually

Author: Felix Cheung <felixcheung_m@hotmail.com>

Closes #18312 from felixcheung/sqljsonwholefiledoc.

docs/sql-programming-guide.md

@@ -998,7 +998,7 @@ Note that the file that is offered as _a json file_ is not a typical JSON file.
 line must contain a separate, self-contained valid JSON object. For more information, please see
 [JSON Lines text format, also called newline-delimited JSON](http://jsonlines.org/).
 
-For a regular multi-line JSON file, set the `wholeFile` option to `true`.
+For a regular multi-line JSON file, set the `multiLine` option to `true`.
 
 {% include_example json_dataset scala/org/apache/spark/examples/sql/SQLDataSourceExample.scala %}
 </div>
@@ -1012,7 +1012,7 @@ Note that the file that is offered as _a json file_ is not a typical JSON file.
 line must contain a separate, self-contained valid JSON object. For more information, please see
 [JSON Lines text format, also called newline-delimited JSON](http://jsonlines.org/).
 
-For a regular multi-line JSON file, set the `wholeFile` option to `true`.
+For a regular multi-line JSON file, set the `multiLine` option to `true`.
 
 {% include_example json_dataset java/org/apache/spark/examples/sql/JavaSQLDataSourceExample.java %}
 </div>
@@ -1025,7 +1025,7 @@ Note that the file that is offered as _a json file_ is not a typical JSON file.
 line must contain a separate, self-contained valid JSON object. For more information, please see
 [JSON Lines text format, also called newline-delimited JSON](http://jsonlines.org/).
 
-For a regular multi-line JSON file, set the `wholeFile` parameter to `True`.
+For a regular multi-line JSON file, set the `multiLine` parameter to `True`.
 
 {% include_example json_dataset python/sql/datasource.py %}
 </div>
@@ -1039,7 +1039,7 @@ Note that the file that is offered as _a json file_ is not a typical JSON file.
 line must contain a separate, self-contained valid JSON object. For more information, please see
 [JSON Lines text format, also called newline-delimited JSON](http://jsonlines.org/).
 
-For a regular multi-line JSON file, set a named parameter `wholeFile` to `TRUE`.
+For a regular multi-line JSON file, set a named parameter `multiLine` to `TRUE`.
 
 {% include_example json_dataset r/RSparkSQLExample.R %}