minor #16640 Update uid.rst (94noni)

This PR was submitted for the 6.0 branch but it was merged into the 5.4 branch instead.

Discussion
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Update uid.rst

Same doc as Ulid but for Uuid

Commits
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c3fe53a Update uid.rst

Author: javiereguiluz

components/uid.rst

@@ -120,7 +120,10 @@ UUID objects created with the ``Uuid`` class can use the following methods
 
     // getting the UUID datetime (it's only available in certain UUID types)
     $uuid = Uuid::v1();
-    $uuid->getDateTime();  // returns a \DateTimeImmutable instance
+    $uuid->getDateTime(); // returns a \DateTimeImmutable instance
+
+    // checking if a given value is valid as UUID
+    $isValid = Uuid::isValid($uuid); // true or false
 
     // comparing UUIDs and checking for equality
     $uuid1 = Uuid::v1();