feat(plugin): update default documentation path

The default documentation path for plugins has been updated from "/Docs" to "/docs".

YumeChan.PluginBase/Infrastructure/PluginDocsAttribute.cs

@@ -14,7 +14,7 @@ namespace YumeChan.PluginBase.Infrastructure;
 [PublicAPI, AttributeUsage(AttributeTargets.Class | AttributeTargets.Assembly)]
 public sealed class PluginDocsAttribute : Attribute
 {
-	public const string DefaultPath = "/Docs";
+	public const string DefaultPath = "/docs";
 
 	/// <summary>
 	/// Defines whether documentation is available for this plugin.