IPEDS 2023-2024 cycle changes - documentation

[AlisonLanski]

1. SFA has updates about Groups etc. [Winter]

2. Fall Enrollment Retention includes students who are still students AND students who graduated really quickly --- check data file instructions to see if we need changes. [Spring]

To see full changes, go here
https://surveys.nces.ed.gov/ipeds/public/changes-to-the-current-year

[AlisonLanski]

1. SFA is not talked about anywhere in the package or documentation; no updates needed here
2. Fall Enrollment Retention can have the same data collection. Update the data requirements table to mention the new clarification from IPEDS