Auto merge of #140083 - ChrisDenton:rollup-o0xjy0y, r=ChrisDenton

Rollup of 5 pull requests

Successful merges:

 - #138870 (Add target-specific NaN payloads for the missing tier 2 targets)
 - #139028 (Make target maintainers more easily pingable)
 - #140063 (Remove stray newline from post-merge report)
 - #140067 (Remove (now unused) #[rustc_macro_edition_2021] attribute)
 - #140068 (replace broken links armv7-rtems-eabihf.md)

r? `@ghost`
`@rustbot` modify labels: rollup