Add descriptions to TypeEnum

app/graphql/types/blob_viewers/type_enum.rb

@@ -6,9 +6,9 @@ module Types
       graphql_name 'BlobViewersType'
       description 'Types of blob viewers'
 
-      value 'rich', value: :rich
-      value 'simple', value: :simple
-      value 'auxiliary', value: :auxiliary
+      value 'rich', value: :rich, description: 'Rich blob viewers type.'
+      value 'simple', value: :simple, description: 'Simple blob viewers type.'
+      value 'auxiliary', value: :auxiliary, description: 'Auxiliary blob viewers type.'
     end
   end
 end

doc/api/graphql/reference/index.md

@@ -5018,9 +5018,9 @@ Types of blob viewers.
 
 | Value | Description |
 | ----- | ----------- |
-| `auxiliary` |  |
-| `rich` |  |
-| `simple` |  |
+| `auxiliary` | Auxiliary blob viewers type. |
+| `rich` | Rich blob viewers type. |
+| `simple` | Simple blob viewers type. |
 
 ### CiConfigStatus