Remove 'listDetails' from release notes for 1.29 (microsoft#6026)

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Author: florelis

doc/ReleaseNotes.md

@@ -1,31 +1,3 @@
 ## New in v1.29
 
 <!-- Nothing yet! -->
-
-# Experimental Feature: 'listDetails'
-
-The new experimental feature `listDetails` enables a new option for the `list` command, `--details`.  When supplied, the output is no longer a table view of the results but is instead a series of `show` like outputs drawing data from the installed item.
-
-An example output for a single installed package is:
-```PowerShell
-> wingetdev list Microsoft.VisualStudio.2022.Enterprise --details
-Visual Studio Enterprise 2022 [Microsoft.VisualStudio.2022.Enterprise]
-Version: 17.14.21 (November 2025)
-Publisher: Microsoft Corporation
-Local Identifier: ARP\Machine\X86\875fed29
-Product Code: 875fed29
-Installer Category: exe
-Installed Scope: Machine
-Installed Location: C:\Program Files\Microsoft Visual Studio\2022\Enterprise
-Available Upgrades:
-  winget [17.14.23]
-```
-
-If sixels are enabled and supported by the terminal, an icon for the installed package will be shown.
-
-To enable this feature, add the 'listDetails' experimental feature to your settings.
-```
-"experimentalFeatures": {
-    "listDetails": true
-},
-```