Document NU5105 deprecation in NuGet 5.6 (#3538)

Author: Copilot

docs/reference/errors-and-warnings/NU5105.md

@@ -3,14 +3,18 @@ title: NuGet Warning NU5105
 description: NU5105 Warning code
 author: mishra14
 ms.author: jodou
-ms.date: 8/8/2018
+ms.date: 03/09/2026
 ms.topic: reference
 ms.reviewer: anangaur
 f1_keywords: 
   - NU5105
 ---
 
 # NuGet Warning NU5105
+
+> [!NOTE]
+> This warning was deprecated in [NuGet 5.6](../../release-notes/NuGet-5.6.md) (Visual Studio 2019 version 16.6 and .NET SDK 3.1.300). Starting from NuGet 5.6, `pack` no longer raises NU5105 when packing a SemVer 2.0 package.
+
 > The package version '1.2.3+semver2.metadata' uses SemVer 2.0.0 or components of SemVer 1.0.0 that are not supported on legacy clients. Change the package version to a SemVer 1.0.0 string. If the version contains a release label it must start with a letter. This message can be ignored if the package is not intended for older clients.
 
 ### Issue

docs/release-notes/NuGet-5.6.md

@@ -72,5 +72,7 @@ NuGet distribution vehicles:
 
 * Sort packages by ID in the Updates tab of the PM UI - [#9278](https://github.com/NuGet/Home/issues/9278)
 
+* Pack no longer raises NU5105 when packing a SemVer 2.0 package - [#9044](https://github.com/NuGet/Home/issues/9044) [#5201](https://github.com/NuGet/Home/issues/5201)
+
 
 **[List of all issues fixed in this release - 5.6](https://app.zenhub.com/workspaces/nuget-client-team-55aec9a240305cf007585881/reports/release?release=5e3b2080c4b30708e48bf9f3)**