Made the example capable of consistent deadlocking
Made the example capable of consistent deadlocking

To augment the didactic effect, made placed the thread::sleep_ms call in the last example, so that there will be time for the other locks to happen; without this, I was unable to observe the deadlock in over 1,000 runs when there was no left-handed philosopher.
GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust