[Outlook] (item multi-select) Update pinning behavior in Outlook on Mac (#5274)

* Update pinnable-taskpane.md

Behavior for macOS client no longer seems to match this behavior.
The task pane in macOS replicates the Outlook on the web behavior, i.e. it stays visible even if it isn't manually pinned by the end user.

* Fix client order for consistency

* Update ms.date

---------

Co-authored-by: Sam Ramon <[email protected]>

Author: Luspin

docs/outlook/pinnable-taskpane.md

@@ -1,7 +1,7 @@
 ---
 title: Implement a pinnable task pane in an Outlook add-in
 description: The task pane UX shape for add-in commands opens a vertical task pane to the right of an open message or meeting request, allowing the add-in to provide UI for more detailed interactions.
-ms.date: 10/01/2024
+ms.date: 07/15/2025
 ms.topic: how-to
 ms.localizationpriority: medium
 ---
@@ -125,9 +125,9 @@ Office.onReady(() => {
 
 ## Task pane pinning in multi-select
 
-In Outlook on the web and new Outlook on Windows, when the task pane of an add-in that implements the [item multi-select](item-multi-select.md) feature is opened, it's automatically pinned to the Outlook client. It remains pinned even when a user switches to a different mail item or selects the **pin** icon from the task pane. The task pane can only be closed by selecting the **Close** button from the task pane.
+In Outlook on the web, on Mac, and in the new Outlook on Windows, when the task pane of an add-in that implements the [item multi-select](item-multi-select.md) feature is opened, it's automatically pinned to the Outlook client. It remains pinned even when a user switches to a different mail item or selects the **pin** icon from the task pane. The task pane can only be closed by selecting the **Close** button from the task pane.
 
-Conversely, in classic Outlook on Windows and Outlook on Mac, the task pane of a multi-select add-in isn't automatically pinned and closes when a user switches to a different mail item.
+Conversely, in classic Outlook on Windows, the task pane of a multi-select add-in isn't automatically pinned and closes when a user switches to a different mail item.
 
 ## Deploy to users