Minor fixes in example requests (#3967) (#3999)

(cherry picked from commit f69f198)

Co-authored-by: Miguel Grinberg <miguel.grinberg@gmail.com>

Author: github-actions[bot]

specification/_global/mtermvectors/examples/request/MultiTermVectorsRequestExample2.yaml

@@ -7,10 +7,8 @@ description: >
 value: |-
   {
     "ids": [ "1", "2" ],
-    "parameters": {
-      "fields": [
-        "message"
-      ],
-      "term_statistics": true
-    }
+    "fields": [
+      "message"
+    ],
+    "term_statistics": true
   }

specification/ml/evaluate_data_frame/examples/request/MlEvaluateDataFrameRequestExample4.yaml

@@ -13,14 +13,14 @@ value:
       filter:
         - term:
             ml.is_training: false
-    evaluation:
-      regression:
-        actual_field: price
-        predicted_field: ml.price_prediction
-        metrics:
-          r_squared: {}
-          mse: {}
-          msle:
-            offset: 10
-          huber:
-            delta: 1.5
+  evaluation:
+    regression:
+      actual_field: price
+      predicted_field: ml.price_prediction
+      metrics:
+        r_squared: {}
+        mse: {}
+        msle:
+          offset: 10
+        huber:
+          delta: 1.5