[fix] upeu description

Author: zwang123

set.mm

@@ -835625,8 +835625,9 @@ have GLB (expanded version).  (Contributed by Zhi Wang,
         RPUOUSRSLUTUQOTRKUQVASKUQQUTUTVBUORSFVCUQUTVDABCDEFGHIJKLMNOPQRSTUOUAUB
         UCUDUEUFUGUHUIUJUKULUMUNVEVF $.
 
-      $( A universal property defines an essentially unique (strong form)
-         object if it exists.  (Contributed by Zhi Wang, 19-Sep-2025.) $)
+      $( A universal property defines an essentially unique (strong form) pair
+         of object ` X ` and morphism ` M ` if it exists.  (Contributed by Zhi
+         Wang, 19-Sep-2025.) $)
       upeu $p |- ( ph -> E! r e. ( X ( Iso ` D ) Y )
            N = ( ( ( X G Y ) ` r ) ( <. Z , ( F ` X ) >. O ( F ` Y ) ) M ) ) $=
         ( cv co cfv cop wceq ciso wrex wrmo wreu ccic wbr upciclem3 simprd eqid