[6.5] [DOCS] Updates to help notes (#50187) (#50208)

Backports the following commits to 6.5:
 - [DOCS] Updates to help notes (#50187)

[skip-ci]

src/core_plugins/timelion/server/series_functions/holt/index.js

@@ -69,10 +69,10 @@ export default new Chainable('holt', {
     }
   ],
   help: `
-    Sample the beginning of a series and use it to forecast what should happen
-    via several optional parameters. In general, like everything, this is crappy at predicting the
-    future. You're much better off using it to predict what should be happening right now, for the
-    purpose of anomaly detection. Note that nulls will be filled with forecasted values. Deal with it.`,
+    Sample the beginning of a series and use it to predict what should happen
+    using several optional parameters. Since predictions are based on part of a series, they can be inaccurate.
+    To discover anomalies, you can also sample the beginning of a series to predict current occurences.
+    NOTE: Nulls contain forecasted values.`,
   fn: function expsmoothFn(args, tlConfig) {
 
     const newSeries = _.cloneDeep(args.byName.inputSeries);