doc: update migration recomendations for util.is**() deprecations

PR-URL: #59269
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jordan Harband <ljharb@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Zeyu "Alex" Yang <himself65@outlook.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: AugustinMauroy

doc/api/deprecations.md

@@ -1085,6 +1085,10 @@ Type: End-of-Life
 The `util.isDate()` API has been removed. Please use
 `arg instanceof Date` instead.
 
+Also for stronger approaches, consider using:
+`Date.prototype.toString.call(arg) === '[object Date]' && !isNaN(arg)`.
+This can also be used in a `try/catch` block to handle invalid date objects.
+
 ### DEP0048: `util.isError()`
 
 <!-- YAML
@@ -1109,9 +1113,7 @@ changes:
 
 Type: End-of-Life
 
-The `util.isError()` API has been removed. Please use
-`Object.prototype.toString(arg) === '[object Error]' || arg instanceof Error`
-instead.
+The `util.isError()` API has been removed. Please use `Error.isError(arg)`.
 
 ### DEP0049: `util.isFunction()`
 
@@ -1272,9 +1274,7 @@ changes:
 
 Type: End-of-Life
 
-The `util.isPrimitive()` API has been removed. Please use
-`arg === null || (typeof arg !=='object' && typeof arg !== 'function')`
-instead.
+The `util.isPrimitive()` API has been removed. Please use `Object(arg) !== arg` instead.
 
 ### DEP0055: `util.isRegExp()`