[DOCS] Adds anomaly detection alert config docs to ML book#1573

Merged

szabosteve merged 3 commits intoelastic:masterfrom

szabosteve:ml.alert

Feb 23, 2021

Commits on Feb 10, 2021

[DOCS] Adds anomaly detection alert config docs to ML book.
szabosteve
committed

Commits on Feb 15, 2021

[DOCS] Adds AD alerts docs to examples.
szabosteve
committed

Commits on Feb 23, 2021

[DOCS] Sorts list items.
szabosteve
committed