Auto merge of #146946 - matthiaskrgr:rollup-fsmrqez, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang/rust#146818 (constify {float}::total_cmp())
 - rust-lang/rust#146896 (rustc-dev-guide subtree update)
 - rust-lang/rust#146898 (Update books)
 - rust-lang/rust#146899 (Fix a crash/mislex when more than one frontmatter closing possibility is considered)
 - rust-lang/rust#146904 (rust-lang/rust#140368 Mutex/RwLock/ReentrantLock::data_ptr to be const fn)
 - rust-lang/rust#146907 (add regression test for issue 146537)

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

Author: bors