None of the dynamically generated selectors are documented for core-data package

[ryanwelcher]

What problem does this address?

The documentation for the core-data package has no entries for any of the dynamically generated selectors that are built based on registered entities.

These selectors are much easier to use and understand then the underlying getEntity/getEntities selectors that power them.

They are missing because the docgen tool has no definition to retrieve from the source and so they are not added to the generated docs.

What is your proposed solution?

There are two possible solutions here:

1: Update the associated .md files manually to add the missing selectors

This approach is probably the easiest to implement as any contributor can update the docs as needed but is subject to human error and requires manual updates should APIs change.

2: Update the docgen tool to process automatically

This is much more work to implement and requires specific knowledge to implement by any one wishing to take this one.

I would propose that we start with manual updates and see what level of effort it would be to update docgen tool at a later date.

[ryanwelcher]

The for manual approach, they can be added above the START_TOKEN line in each section. This will allow them to be added before the generated ones are added.