Added/updated snippets for docs (#2318)

docs/doc_examples/ae82eb17c23cb8e5761cb6240a5ed0a6.asciidoc

@@ -0,0 +1,23 @@
+// 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: "student_performance_mathematics_0.3",
+  source: {
+    index: "student_performance_mathematics",
+  },
+  dest: {
+    index: "student_performance_mathematics_reg",
+  },
+  analysis: {
+    regression: {
+      dependent_variable: "G3",
+      training_percent: 70,
+      randomize_seed: 19673948271,
+    },
+  },
+});
+console.log(response);
+----