Auto merge of rust-lang#123592 - matthiaskrgr:rollup-3k1pq8s, r=matthiaskrgr

Rollup of 2 pull requests

Successful merges:

 - rust-lang#123584 (Emit an error when `rustc_doc_primitive` has an unknown value)
 - rust-lang#123589 (sys_common::thread_local_key: make a note that this is not used on Windows)

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

Author: bors

std/src/sys_common/thread_local_key.rs

@@ -1,4 +1,4 @@
-//! OS-based thread local storage
+//! OS-based thread local storage for non-Windows systems
 //!
 //! This module provides an implementation of OS-based thread local storage,
 //! using the native OS-provided facilities (think `TlsAlloc` or
@@ -11,6 +11,9 @@
 //! the OS-TLS key. The other is a type which does implement `Drop` and hence
 //! has a safe interface.
 //!
+//! Windows doesn't use this module at all; `sys::pal::windows::thread_local_key`
+//! gets imported in its stead.
+//!
 //! # Usage
 //!
 //! This module should likely not be used directly unless other primitives are