updated data_container.ipynb to reflect changes to pm.Data containers in pymc v5.16 (#676)

* updated data_container.ipynb to reflect changes to pm.Data containers

* replaced section with info box about deprecated data container, added  to , fixed typo

* swapped out class pm.Data to just pm.Data

* swapped pm.Data to class pymc.data in markdown text

* modified text around deprecated Mutable and Constant data containers

Author: Dekermanjian