Rollup merge of #43793 - j-browne:master, r=steveklabnik
Rollup merge of #43793 - j-browne:master, r=steveklabnik

Fix broken links in Arc documentation

Some link references had ticks, when they should not have had them.

graydon/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust