Documentation for pending key and info classes and some other improvements whilst investigating #4553
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The motivation for this PR was a desire to document pending_key and pending_info classes.
However, before I could document them, I needed to understand them.
I created a test case for pending table to help me understand it.
I created a function to print the pending table for learning and debugging purposes.
And whilst creating that test case, I noticed that there were refactoring improvements that could be made.