Added/updated snippets for docs (#2318)

docs/doc_examples/e8211247c280a3fbbbdd32850b743b7b.asciidoc

@@ -0,0 +1,21 @@
+// This file is autogenerated, DO NOT EDIT
+// Use `node scripts/generate-docs-examples.js` to generate the docs examples
+
+[source, js]
+----
+const response = await client.ml.putDataFrameAnalytics({
+  id: "house_price_regression_analysis",
+  source: {
+    index: "houses_sold_last_10_yrs",
+  },
+  dest: {
+    index: "house_price_predictions",
+  },
+  analysis: {
+    regression: {
+      dependent_variable: "price",
+    },
+  },
+});
+console.log(response);
+----