Doc for maskValue() function

Author: SadiHassan

docs/en/core-libraries/text.md

@@ -465,6 +465,22 @@ Replaces characters starting at `$offset` for `$length` characters with `$maskCh
 If `$length` is `null`, masking continues to the end of the string.
 Negative offsets are supported and are calculated from the end of the string.
 
+```php
+$creditCardNumber = '4909090909091234';
+
+// Called as TextHelper
+echo $this->Text->mask($creditCardNumber, 0, 12, '*');
+
+// Called as Text
+use Cake\Utility\Text;
+
+echo Text::mask($creditCardNumber, 0, 12, '*');
+```
+
+Output:
+
+    ************1234
+
 ### Text::maskValue()
 
 `method` Cake\\Utility\\Text::**maskValue**(string $string, array $needles, string $maskCharacter = '*'): string
@@ -486,5 +502,4 @@ echo Text::maskValue('4111111111111234', ['411', '112'], '*');
 Output:
 
     ***11111111***34
-
 <!-- end-text -->