POD added to last set of Macros.

Internationalized an error message in Product.
Fixed typos in docs in Macro_Product.pm

lib/WebGUI/Macro/SubscriptionItemPurchaseUrl.pm

@@ -3,6 +3,25 @@ package WebGUI::Macro::SubscriptionItemPurchaseUrl;
 use strict;
 use WebGUI::URL;
 
+=head1 NAME
+
+Package WebGUI::Macro::SubscriptionItemPurchaseUrl
+
+=head1 DESCRIPTION
+
+Macro that returns a URL to purchase a subscription item.
+
+=head2 process ( subscriptionId )
+
+process returns a URL that is the current page with an operation appended
+to purchase the requested subscription item.
+
+=head3 subscriptionId
+
+The ID of the subscription item to purchase.
+
+=cut
+
 sub process {
 	return WebGUI::URL::page('op=purchaseSubscription;sid='.shift);
 }