[8.3][DOCS] Adds ML-related highlights through yaml files. (#87908)

Author: szabosteve

docs/changelog/85958.yaml

@@ -4,3 +4,15 @@ summary: Adds new `question_answering` NLP task for extracting answers to questi
 area: Machine Learning
 type: enhancement
 issues: []
+highlight:
+  title: Question answering NLP task
+  body: |-
+    We introduce a new question answering NLP task in 8.3. This task extracts 
+    the relevant section that answers a specific question from a larger context. 
+    This is especially suited to search requests against large documents. You 
+    can find an example of extracting an answer from a larger wiki article about 
+    Tower Bridge below.
+    
+    [role="screenshot"]
+    image::../images/nlp-qa-rh.png[A screenshot of a question answering NLP task in {kib}]
+  notable: true

docs/changelog/86501.yaml

@@ -0,0 +1,12 @@
+pr: 86501
+summary: Support `range` aggregation in transform
+area: Transform
+type: enhancement
+issues: []
+highlight:
+  title: Transforms support range aggregation
+  body: |-
+    Now it is possible to use the range aggregations in {transforms}. 
+    {transforms-cap} didn’t support multi-bucket aggregations, but this 
+    limitation no longer exist.
+  notable: true