docs(faq): document the AngularJS/jqLite deprecation strategy

Fixes #15282

Author: mgol

docs/content/misc/faq.ngdoc

@@ -130,6 +130,15 @@ AngularJS 1.3 only supports jQuery 2.1 or above. jQuery 1.7 and newer might work
 but we don't guarantee that.
 
 
+### When will the deprecated features be removed from the library?
+Most of the time we remove a deprecated feature in a next minor bump. For example, the `preAssignBindingsEnabled`
+`$compileProvider` method was defined in AngularJS `1.5.10`, deprecated in `1.6` and will be removed in `1.7`.
+
+In case of jqLite we apply a different strategy - we deprecate features that have an equivalent in jQuery that
+is also deprecated but we only remove the feature once it's removed from jQuery to improve compatibility between
+jqLite and jQuery. One such example is the `bind` method, deprecated in favor of `on` but unlikely to be removed
+from jqLite any time soon.
+
 ### What is testability like in AngularJS?
 
 Very testable and designed this way from the ground up. It has an integrated dependency injection