Pamela's Merge Request: 01-07-2022

Corresponding Manual Numbers were added to References Section for the following files: 'Dining_Philosophers', 'Railroad_Crossing_Safety', 'Replay_Attack', and 'Web_Browser_Formal_Security'. Borders were adjusted accordingly.

requested review from @kmgiamma

assigned to @pamela.dyer_uconn.edu

merged

mentioned in commit 57292e5e