Register new snapshots
auto merge of #14900 : alexcrichton/rust/snapshots, r=huonw

Closes #14898
Closes #14918
Fix rustdoc's formatting of lifetimes

rustdoc was previously formatting lifetimes with two apostrophes, presumably
as a result of #14797.
auto merge of #14906 : P1start/rust/rustdoc-lifetimes, r=huonw

rustdoc was previously formatting lifetimes with two apostrophes, presumably as a result of #14797.