Improve tutorial program to show how to catch and re-raise a panic.
Improve tutorial program to show how to catch and re-raise a panic.

Some other clarifications added as well.

Co-authored-by: Garrett D'Amore <3d16c00ea5e6ea0de3ce0a04724885f2fc30401a@damore.org>

gdamore/tcell,gdamore/tcell