doc: fix inconsistencies in WeakSet and WeakMap comparison details

PR-URL: #56683
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Jason Zhang <xzha4350@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: ishon19

doc/api/assert.md

@@ -904,11 +904,12 @@ weakSet2.add(obj);
 
 // Comparing different instances fails, even with same contents
 assert.deepStrictEqual(weakSet1, weakSet2);
-// AssertionError: Expected inputs to be strictly deep-equal:
+// AssertionError: Values have same structure but are not reference-equal:
 // + actual - expected
 //
-// + WeakSet { <items unknown> }
-// - WeakSet { <items unknown> }
+// WeakSet {
+//   <items unknown>
+// }
 
 // Comparing the same instance to itself succeeds
 assert.deepStrictEqual(weakSet1, weakSet1);
@@ -1013,11 +1014,12 @@ weakSet2.add(obj);
 
 // Comparing different instances fails, even with same contents
 assert.deepStrictEqual(weakSet1, weakSet2);
-// AssertionError: Expected inputs to be strictly deep-equal:
+// AssertionError: Values have same structure but are not reference-equal:
 // + actual - expected
 //
-// + WeakSet { <items unknown> }
-// - WeakSet { <items unknown> }
+// WeakSet {
+//   <items unknown>
+// }
 
 // Comparing the same instance to itself succeeds
 assert.deepStrictEqual(weakSet1, weakSet1);