Fixing Dead Link (MicrosoftDocs#4300)

* Fixing Dead Link

The link *How to Declare Input Validation Rules* under Remarks, bullet point #1 was pointing to a dead link. I have modified it to point to the most relevant reference page I could find on that topic.

* Update validatelength-attribute-declaration.md

Author: ssimontis

developer/cmdlet/validatelength-attribute-declaration.md

@@ -33,7 +33,7 @@ Required. Specifies the maximum number of characters allowed.
 
 ## Remarks
 
-- For more information about how to declare this attribute, see [How to Declare Input Validation Rules](http://msdn.microsoft.com/en-us/544c2100-62ba-4be4-b2a2-cc0d4e4fc45b).
+- For more information about how to declare this attribute, see [How to Declare Input Validation Rules](./how-to-validate-parameter-input.md).
 
 - When this attribute is not used, the corresponding parameter argument can be of any length.