add note about CL changing on sealed caps

Author: tariqkurd-repo

src/cap-description.adoc

@@ -308,6 +308,8 @@ around. The only way of clearing the type bit of a capability is by rebuilding
 it via a superset capability with <<CBLD>>. {cheri_base_ext_name} does not offer
 an unseal instruction.
 
+NOTE: The <<section_cap_level>> field can be reduced even if the capability is sealed, see <<cap_level_load_summary>>.
+
 For code capabilities, the sealing bit is used to implement immutable
 capabilities that describe function entry points, known as sealed entry (sentry) capabilities. Such capabilities can be leveraged
 to establish a form of control-flow integrity between mutually distrusting code. A program may jump to a