Remove doctest

Signed-off-by: Chen Dai <daichen@amazon.com>

Author: dai-chen

docs/user/admin/settings.rst

@@ -260,61 +260,6 @@ Result set::
       "transient": {}
     }
 
-plugins.sql.delete.enabled
-======================
-
-Description
------------
-
-By default, DELETE clause disabled. You can enable DELETE clause by this setting.
-
-1. The default value is false.
-2. This setting is node scope.
-3. This setting can be updated dynamically.
-
-
-Example 1
----------
-
-You can update the setting with a new value like this.
-
-SQL query::
-
-    sh$ curl -sS -H 'Content-Type: application/json' -X PUT localhost:9200/_plugins/_query/settings \
-    ... -d '{"transient":{"plugins.sql.delete.enabled":"false"}}'
-    {
-      "acknowledged": true,
-      "persistent": {},
-      "transient": {
-        "plugins": {
-          "sql": {
-            "delete": {
-              "enabled": "false"
-            }
-          }
-        }
-      }
-    }
-
-Example 2
----------
-
-Query result after the setting updated is like:
-
-SQL query::
-
-    sh$ curl -sS -H 'Content-Type: application/json' -X POST localhost:9200/_plugins/_sql \
-    ... -d '{"query" : "DELETE * FROM accounts"}'
-    {
-      "error": {
-        "reason": "Invalid SQL query",
-        "details": "DELETE clause is disabled by default and will be deprecated. Using the plugins.sql.delete.enabled setting to enable it",
-        "type": "SQLFeatureDisabledException"
-      },
-      "status": 400
-    }
-
-
 plugins.query.executionengine.spark.session.limit
 ==================================================