[DOCS-12638] Add enablePrivacyForActionName flag info (#33290)

Author: rtrieu

content/en/real_user_monitoring/application_monitoring/browser/tracking_user_actions.md

@@ -38,6 +38,20 @@ The `trackUserInteractions` initialization parameter enables the collection of u
 
 To control which information is sent to Datadog, you can [mask action names with privacy options][2], [manually set an action name](#declare-a-name-for-click-actions), or [implement a global scrubbing rule in the Datadog Browser SDK for RUM][3].
 
+### Mask all action names
+
+To mask all action names by default, use the `enablePrivacyForActionName` initialization parameter:
+
+```javascript
+window.DD_RUM.init({
+    ...
+    trackUserInteractions: true,
+    enablePrivacyForActionName: true,
+});
+```
+
+When enabled, all action names are replaced with `Masked Element`. Action names explicitly set with the `data-dd-action-name` attribute are still displayed, allowing you to selectively expose specific action names while keeping others masked.
+
 ## Track user interactions
 
 The RUM Browser SDK automatically tracks clicks to generate click actions. A one-click action generally represents one user click, except when the same element is clicked multiple times in a row, which is considered a single action (see [Frustration Signals "rage clicks"][4]).
@@ -103,11 +117,13 @@ For example:
 
 ### How action names are computed
 
-The Datadog Browser SDK uses different strategies to compute click action names:
+The Datadog Browser SDK uses the following strategies to compute click action names:
 
 1. If the `data-dd-action-name` attribute or a custom attribute (as explained above) is explicitly set by the user on the clicked element (or one of its parents), its value is used as the action name.
 
-2. If `data-dd-action-name` attribute or its equivalent is not set, depending on the element type, the sdk uses other attributes such as `label`, `placeholder`, `aria-label` from the element or its parents to construct the action name. If none of these attributes is found, the sdk uses the inner text as name for the action.
+2. If no explicit action name attribute is set and `enablePrivacyForActionName` is enabled, the action name is set to `Masked Element`.
+
+3. Otherwise, depending on the element type, the SDK uses other attributes such as `label`, `placeholder`, or `aria-label` from the element or its parents to construct the action name. If none of these attributes is found, the SDK uses the inner text as the action name.
 
 ## Send custom actions