DOC Deprecate FormField Value

Author: emteknetnz

en/08_Changelogs/5.4.0.md

@@ -320,6 +320,8 @@ See [indexes](/developer_guides/model/indexes/) to learn about indexes in Silver
 - The `$join` parameter for the [`Subsite::get_from_all_subsites()`](api:SilverStripe\Subsites\Model\Subsite::get_from_all_subsites()) method has been deprecated. Use [leftJoin($table, $joinClause)](api:SilverStripe\ORM\DataList::leftJoin()) instead.
 - Passing a boolean value to the `$mergeStrategy` argument in [`Form::loadDataFrom()`](api:Silverstripe\Forms\Form::loadDataFrom()) has been deprecated. Pass [`Form::MERGE_CLEAR_MISSING`](api:Silverstripe\Forms\Form::MERGE_CLEAR_MISSING) instead of `true` and `0` instead of `false`.
 - The [`HTTP.ignoreDeprecatedCaching`](api:SilverStripe\Control\HTTP->ignoreDeprecatedCaching) configuration property has been deprecated. It will be removed without equivalent functionality to replace it.
+- [`FormField::Value()`](api:SilverStripe\Forms\FormField::Value()) has been deprecated. It will be replaced with `getValue()` and `getFormattedValue()`.
+- [`TextareaField::ValueEntities()`](api:SilverStripe\Forms\TextareaField::ValueEntities()) has been deprecated. It will be replaced with `getFormattedValueEntities()`.
 
 ## Bug fixes