chore: add changelog entry & doc json format

Author: jvancoillie

src/Autocomplete/CHANGELOG.md

@@ -1,5 +1,23 @@
 # CHANGELOG
 
+## 2.6.0
+
+- Added support for using `Option Group`: the JSON format takes two new entries
+`options` and `optgroups`
+
+```json
+{
+  "results": {
+    "options": [
+      {"value": "1", "text": "Pizza", "group_by": ["food"]},
+      {"value": "2", "text": "Banana", "group_by": ["food"]}
+    ],
+    "optgroups":[
+      {"value":"food","label":"food"}
+    ]
+  }
+}
+```
 ## 2.5.0
 
 -   Automatic pagination support added: if the query would return more results

src/Autocomplete/src/Resources/doc/index.rst

@@ -484,10 +484,12 @@ a :ref:`custom autocompleter <custom-autocompleter>`:
     .. code-block:: json
 
         {
-            "results": [
-                { "value": "1", "text": "Pizza" },
-                { "value": "2", "text":"Banana"}
-            ]
+            "results": {
+                "options": [
+                    { "value": "1", "text": "Pizza" },
+                    { "value": "2", "text":"Banana"}
+                ]
+            }
         }
 
     Once you have this, generate the URL to your controller and