Fix error checking

discord/abc.py

@@ -1646,7 +1646,7 @@ class Messageable:
         if voice:
             if content is not None:
                 raise TypeError('Cannot send content with a voice message')
-            if embeds is not None:
+            if embed is not None or embeds is not None:
                 raise TypeError('Cannot send embeds with a voice message')
             if file is None:
                 raise TypeError('A voice message must have a file')