fixup! Add first cut of git-credential-fdoss

Expand note on the `Secret` struct that is marshalable by the dbus
library.

Update the link to the spec which just changed.

Addresses: #3 (comment)

dbus.go

@@ -23,10 +23,11 @@ type SecretService struct {
 }
 
 // Secret is a struct compatible with the [Secret] struct type as defined in
-// the specification. This Go struct is marshalable by the dbus library into
-// the correct wire format.
+// the specification. This Go struct uses types that are marshalable by the
+// dbus library into the correct wire format - no struct tags or other magic
+// needed.
 //
-// [Secret]: // https://specifications.freedesktop.org/secret-service-spec/latest/types.html#type-Secret
+// [Secret]: https://specifications.freedesktop.org/secret-service-spec/latest/types.html#type-Secret
 type Secret struct {
 	Session     dbus.ObjectPath
 	Params      []byte