Update block docs for: iteration.md

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+## Step Through Items
+
+### What it is
+A logical component that helps you process lists or collections of items one at a time, like going through items in a shopping list one by one.
+
+### What it does
+Takes a collection of items (either as a list or a dictionary) and processes them individually, outputting each item along with its position or identifier in the sequence.
+
+### How it works
+The component accepts your collection of items and then:
+1. Checks if you've provided items in any of the accepted formats
+2. Goes through each item one by one
+3. For each item, provides both the item itself and its position/identifier
+4. Continues until all items have been processed
+
+### Inputs
+- Items: A list of items you want to process (like [1, 2, 3] or ["apple", "banana", "orange"])
+- Items Object: A dictionary of items with labels (like {"fruit": "apple", "vegetable": "carrot"})
+- Items String: A text version of your list or dictionary, useful when your data comes as formatted text
+
+### Outputs
+- Item: The current item being processed from your collection
+- Key: The position (for lists) or label (for dictionaries) of the current item
+
+### Possible use cases
+- Processing a list of customer orders one at a time
+- Going through a collection of files in a folder
+- Handling survey responses individually
+- Processing inventory items one by one
+- Working through a series of tasks in sequence