Dashboard: Remove super old prop that has not been used in years (#50826)

docs/sources/dashboards/json-model.md

@@ -37,7 +37,6 @@ When a user creates a new dashboard, a new dashboard JSON object is initialized
   "style": "dark",
   "timezone": "browser",
   "editable": true,
-  "hideControls": false,
   "graphTooltip": 1,
   "panels": [],
   "time": {

docs/sources/developers/http_api/dashboard.md

@@ -406,7 +406,6 @@ Content-Type: application/json
 {
   "dashboard": {
     "editable":false,
-    "hideControls":true,
     "nav":[
       {
         "enable":false,

docs/sources/developers/http_api/dashboard_versions.md

@@ -177,7 +177,6 @@ Content-Length: 1300
 
 - **version** - The dashboard version to restore to
 
-**Example response**:
 **Example response**:
 
 ```http
@@ -290,7 +289,6 @@ Content-Length: 1300
 JSON body schema:
 
 - **base** - an object representing the base dashboard version
-- **diffType** - the type of diff to return. Can be "json" or "basic".
 - **new** - an object representing the new dashboard version
 - **diffType** - the type of diff to return. Can be "json" or "basic".
 

docs/sources/developers/http_api/snapshot.md

@@ -29,7 +29,6 @@ title: 'HTTP Snapshot API '
     {
       "dashboard": {
         "editable":false,
-        "hideControls":true,
         "nav":[
         {
           "enable":false,
@@ -157,7 +156,6 @@ Content-Type: application/json
 This API call can be used without authentication by using the secret delete key for the snapshot.
 
 `GET /api/snapshots-delete/:deleteKey`
-
 
 **Example Request**: