Merge branch '227106-docs-feedback-describe-nuget-v2-support' into 'master'

Docs feedback: Describe NuGet v2 support

Closes #227106

See merge request gitlab-org/gitlab!37839

doc/user/packages/nuget_repository/index.md

@@ -43,6 +43,9 @@ Available commands:
 [output truncated]
 ```
 
+NOTE: **Note:**
+GitLab currently only supports NuGet v3. Earlier versions are not supported.
+
 ### macOS support
 
 For macOS, you can also use [Mono](https://www.mono-project.com/) to run