[DOCS] Fixes machine learning links (#778)

Author: lcawl

docs/60_upgrade_guide.html

@@ -861,7 +861,7 @@
 [[Upgrade Elasticsearch for Hadoop to 5.6.|https://www.elastic.co/guide/en/elasticsearch/hadoop/5.6/install.html]]\
 &lt;&lt;endif&gt;&gt;\</tw-passagedata><tw-passagedata pid="12" name="rolling-upgrade-60" tags="" position="1401,476">!!!Upgrade to 6.3
 &lt;&lt;if $xpack_ml&gt;&gt;\
-[[Stop any running Machine Learning jobs.|https://www.elastic.co/guide/en/elastic-stack-overview/6.3/stopping-ml.html]]
+[[Stop any running Machine Learning jobs.|https://www.elastic.co/guide/en/machine-learning/6.3/stopping-ml.html]]
 &lt;&lt;endif&gt;&gt;\
 &lt;&lt;if $hadoop&gt;&gt;\
 &lt;span class=&quot;pseudo-link&quot;&gt;Disable ingestion from Hadoop while you upgrade the stack.&lt;/span&gt;

docs/en/getting-started/get-started-stack.asciidoc

@@ -21,8 +21,8 @@ laptop.
 IMPORTANT: Implementing security is a critical step in setting up the {stack}.
 To get up and running quickly with a sample installation, you skip those steps
 right now. Before sending sensitive data across the network, make sure you
-{stack-ov}/elasticsearch-security.html[secure the {stack}] and enable
-{stack-ov}/encrypting-communications.html[encrypted communications].
+{ref}/elasticsearch-security.html[secure the {stack}] and enable
+{ref}/encrypting-communications.html[encrypted communications].
 
 [float]
 [[install-prereqs]]
@@ -1020,7 +1020,7 @@ Next, you'll want to set up the {stack} {security-features} and activate your
 trial license so you can unlock the full capabilities of the {stack}. To learn
 how, read:
 
-* {stack-ov}/elasticsearch-security.html[Securing the {stack}]
+* {ref}/elasticsearch-security.html[Securing the {stack}]
 * {stack-ov}/license-management.html[License Management]
 
 Want to get up and running quickly with metrics monitoring and

docs/en/siem/machine-learning.asciidoc

@@ -53,7 +53,7 @@ anomaly results to reduce the number of false positive, see <<tuning-anomaly-res
 To view the `Anomalies` table widget and `Max Anomaly Score By Job` details,
 the user must have the `ml_admin` or `ml_user` role.
 
-NOTE: To adjust the `score` threshold for which {stack-ov}/xpack-ml.html[anomalies]
+NOTE: To adjust the `score` threshold for which {ml-docs}/xpack-ml.html[anomalies]
 are shown, you can modify {kib} -> Management -> Advanced Settings -> `siem:defaultAnomalyScore`.
 
 [[prebuilt-ml-jobs]]

docs/en/siem/tune-anomaly-results.asciidoc

@@ -59,7 +59,7 @@ example).
 .. The filter you created as part of the <<create-fiter-list>> procedure.
 +
 TIP: For more information about detectors, see
-{stack-ov}/ml-jobs.html[Anomaly detection jobs].
+{ml-docs}/ml-jobs.html[Anomaly detection jobs].
 
 . Click *Save*.
 

docs/en/stack/license.asciidoc

@@ -31,7 +31,7 @@ you install in {kib} or by using the {ref}/update-license.html[update license AP
 
 TIP: If you are using a basic or trial license, {security-features} are disabled
 by default. In all other licenses, {security-features} are enabled by default;
-you must {stack-ov}/security-getting-started.html[secure the {stack}] or disable
+you must {ref}/secure-cluster.html[secure the {stack}] or disable
 the {security-features}. 
 
 --

docs/en/stack/ml/anomaly-detection/create-jobs.asciidoc

@@ -22,7 +22,7 @@ than running multiple jobs against the same data.
 
 A _population job_ detects activity that is unusual compared to the behavior of
 the population. For more information, see
-{stack-ov}/ml-configuring-pop.html[Performing population analysis].
+{ml-docs}/ml-configuring-pop.html[Performing population analysis].
 
 An _advanced job_ can contain multiple detectors and enables you to configure all
 job settings.
@@ -73,7 +73,7 @@ create and manage jobs and post data to them. For more information, see
 
 ////
 Ready to get some hands-on experience? See
-{stack-ov}/ml-getting-started.html[Getting Started with Machine Learning].
+{ml-docs}/ml-getting-started.html[Getting Started with Machine Learning].
 
 The following video tutorials also demonstrate single metric, multi-metric, and
 advanced jobs: