Update valid-strong-password.md

Author: milwad-dev

docs/1.x/valid-strong-password.md

@@ -1,6 +1,6 @@
 ## ValidStrongPassword
 
-If you are using the `ValidStrongPassword` rule, the password must be contain a capital word, a small letter, numbers, and a special character like (!@#$%^&*):
+If you are using the `ValidStrongPassword` rule, the password must contain a capital word, a small letter, numbers, and a special character like (!@#$%^&*):
 
 ```php
 use Milwad\LaravelValidate\Rules\ValidStrongPassword;