Fix formatting of description in SKILL.md

Author: psimsa

skills/nuget-manager/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: nuget-manager
-description: Manage NuGet packages in .NET projects/solutions. Use this skill when adding, removing, or updating NuGet package versions. It enforces using `dotnet` CLI for package management and provides strict procedures for direct file edits only when updating versions.
+description: 'Manage NuGet packages in .NET projects/solutions. Use this skill when adding, removing, or updating NuGet package versions. It enforces using `dotnet` CLI for package management and provides strict procedures for direct file edits only when updating versions.'
 ---
 
 # NuGet Manager