Update active_record_validations.md

Author: Valerii-Pi

guides/source/active_record_validations.md

@@ -1240,7 +1240,7 @@ the `validates_with` method.
 class MyValidator < ActiveModel::Validator
   def validate(record)
     unless record.name.start_with? 'X'
-      record.errors.add :name, "Need a name starting with X please!"
+      record.errors.add :name, "Provide a name starting with X, please!"
     end
   end
 end