[DOCS] Add missing ML create job API options (elastic/x-pack-elasticsearch#2268)

* [DOCS] Add missing ML create job API options

* [DOCS] Small fixes in ML create job API

Original commit: elastic/x-pack-elasticsearch@369bd5bfbb

docs/en/rest-api/ml/jobresource.asciidoc

@@ -28,6 +28,11 @@ so do not set the `background_persist_interval` value too low.
 `create_time`::
   (string) The time the job was created. For example, `1491007356077`.
 
+`custom_settings`::
+  (object) Advanced configuration option. Contains custom meta data about the
+  job. For example, it can contain custom URL information as shown in
+  {xpack-ref}/ml-configuring-url.html[Adding Custom URLs to Machine Learning Results].
+
 `data_description`::
   (object) Describes the data format and how APIs parse timestamp fields.
   See <<ml-datadescription,data description objects>>.

docs/en/rest-api/ml/put-job.asciidoc

@@ -26,6 +26,14 @@ The create job API enables you to instantiate a job.
   (object) Specifies runtime limits for the job. See
   <<ml-apilimits,analysis limits>>.
 
+`background_persist_interval`::
+  (time units) Advanced configuration option. The time between each periodic
+  persistence of the model. See <<ml-job-resource>>.
+
+`custom_settings`::
+  (object) Advanced configuration option. Contains custom meta data about the
+  job. See <<ml-job-resource>>.
+
 `data_description` (required)::
   (object) Describes the format of the input data. This object is required, but
   it can be empty (`{}`). See <<ml-datadescription,data description objects>>.
@@ -37,26 +45,33 @@ The create job API enables you to instantiate a job.
   (array of strings) A list of job groups. See <<ml-job-resource>>.
 
 `model_plot`::
-  (object) This advanced configuration option stores model information along
-  with the results. This adds overhead to the performance of the system and is
-  not feasible for jobs with many entities, see <<ml-apimodelplotconfig>>.
+  (object) Advanced configuration option. Specifies to store model information
+  along with the results. This adds overhead to the performance of the system
+  and is not feasible for jobs with many entities, see <<ml-apimodelplotconfig>>.
 
 `model_snapshot_retention_days`::
   (long) The time in days that model snapshots are retained for the job.
   Older snapshots are deleted. The default value is 1 day. For more information
   about model snapshots, see <<ml-snapshot-resource>>.
 
+`renormalization_window_days`::
+  (long) Advanced configuration option. The period over which adjustments to the
+  score are applied, as new data is seen. See <<ml-job-resource>>.
+
 `results_index_name`::
   (string) The name of the index in which to store the {ml} results. The default
   value is `shared`, which corresponds to the index name `.ml-anomalies-shared`.
 
+`results_retention_days`::
+  (long) Advanced configuration option. The number of days for which job results
+  are retained. See <<ml-job-resource>>.
 
 ==== Authorization
 
 You must have `manage_ml`, or `manage` cluster privileges to use this API.
 For more information, see
 {xpack-ref}/security-privileges.html[Security Privileges].
-//<<privileges-list-cluster>>.
+
 
 ==== Examples