docs(ngParseExt): note limitations with ngOptions and ngRepeat

Closes angular#15954
Closes angular#15926

Author: Narretz

src/ngParseExt/module.js

@@ -6,6 +6,12 @@
  * @ngdoc module
  * @name ngParseExt
  * @packageName angular-parse-ext
+ *
+ * @knownIssue
+ * You cannot use Unicode characters for variable names in the {@link ngRepeat} or {@link ngOptions}
+ * expressions (e.g. `ng-repeat="f in поля"`), because they don't use the {@link `$parse`} service
+ * to parse the expression.
+ *
  * @description
  *
  * The `ngParseExt` module provides functionality to allow Unicode characters in