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This commit updates the documentation for the `valid` method of the following iterators: - `EmptyIterator` - add a note that this will always return false - `FilterIterator` - add a note that the value will be false until the pointer is advanced to the first valid element - `IteratorIterator` - clarify that the method checks if the element is valid. These now match the source. I have checked other iterators and these seem to be correctly documented. It's worth noting that the `ArrayIterator::valid` method behaves differently - it checks if the next element is valid (confirmed in source). The `DirectoryIterator::valid` method may also be incorrectly documented but I am not 100% sure of this. The documentation states that the method checks if it is a valid _file_, but I believe that the method checks if the Iterator element is valid.