Add visits info

PureGym/Auth.fs

@@ -10,11 +10,16 @@ open System.Threading.Tasks
 // System.Text.Json does not support internal F# records as of .NET 8, presumably because it can't find the constructor.
 // So we end up with this gruesome soup of C#.
 // TODO(net8): make this internal
+/// An internal type. Don't use it.
 type AuthResponseRaw [<JsonConstructor>] (access_token : string, expires_in : int, token_type : string, scope : string)
     =
+    /// Don't use this internal type.
     member _.access_token = access_token
+    /// Don't use this internal type.
     member _.expires_in = expires_in
+    /// Don't use this internal type.
     member _.token_type = token_type
+    /// Don't use this internal type.
     member _.scope = scope
 
 /// A token which can be used to authenticate with the PureGym API.