🎨 enhance invitation validation tips for clarity

Author: pcrespov

services/web/server/src/simcore_service_webserver/invitations/_service.py

@@ -79,6 +79,7 @@ async def validate_invitation_url(
             guest_email=guest_email,
             current_product=current_product,
             invitation=invitation,
+            tip="Check the url of the invitation link and see if it associated to the product in the invitation",
         )
 
     # check invitation used
@@ -95,8 +96,7 @@ async def validate_invitation_url(
             guest_email=guest_email,
             current_product=current_product,
             invitation=invitation,
-            tip="A user might be already registered or was registered for a different product."
-            "As soon as the user is registered, the invitation is invalidated",
+            tip="As soon as the user is registered, the invitation is invalidated",
         )
 
     return invitation