[DOCS] Adds ML API examples (DELETE ops) (#2518)

* [DOCS] Adds anomaly detection API examples.

* [DOCS] Adds more ML examples.

* [DOCS] Further edits.

* [DOCS] Fixes style.

Author: szabosteve

specification/ml/delete_calendar/examples/200_response/MlDeleteCalendarResponseExample1.json

@@ -0,0 +1,6 @@
+{
+  "summary": "A successful response when deleting a calendar.",
+  "value": {
+    "acknowledged": true
+  }
+}

specification/ml/delete_calendar_event/examples/200_response/MlDeleteCalendarEventResponseExample1.json

@@ -0,0 +1,6 @@
+{
+  "summary": "A successful response when deleting a calendar event.",
+  "value": {
+    "acknowledged": true
+  }
+}

specification/ml/delete_calendar_job/examples/200_response/MlDeleteCalendarJobResponseExample1.json

@@ -0,0 +1,7 @@
+{
+  "summary": "A successful response when deleting an anomaly detection job from a calendar.",
+  "value": {
+    "calendar_id": "planned-outages",
+    "job_ids": []
+  }
+}

specification/ml/delete_data_frame_analytics/examples/200_response/MlDeleteDataFrameAnalyticsResponseExample1.json

@@ -0,0 +1,6 @@
+{
+  "summary": "A successful response when deleting a data frame analytics job.",
+  "value": {
+    "acknowledged": true
+  }
+}

specification/ml/delete_datafeed/examples/200_response/MlDeleteDatafeedResponseExample1.json

@@ -0,0 +1,6 @@
+{
+  "summary": "A successful response when deleting a datafeed.",
+  "value": {
+    "acknowledged": true
+  }
+}