filter out description attribute (#132)

Author: cjsha

filter.yml

@@ -8,5 +8,5 @@ apiRules:
 # https://github.com/dotnet/docfx/blob/af68cbdd73b803a010fd8c22ad64148bf6337a8f/src/Docfx.Dotnet/Resources/defaultfilterconfig.yml#L35-L40
 attributeRules:
 - include: # this is necessary to pull our custom attributes into .yml metadata without disabling default filter
-    uidRegex: ^System\.ComponentModel\.(CategoryAttribute|DescriptionAttribute)$
+    uidRegex: ^System\.ComponentModel\.CategoryAttribute$
     type: Type