Rollup merge of #101322 - ChrisDenton:internal-doc, r=Mark-Simulacrum

Fix internal doc link

The doc link from `DedupSortedIter` to `BTreeMap::bulk_build_from_sorted_iter` was broken when building internal documentation,

This prevented me from building internal documentation locally:

```
R:\Rust\rust> $env:RUSTDOCFLAGS="--document-private-items"
R:\Rust\rust> x doc library/std --open --stage 0
Building rustbuild
   Compiling bootstrap v0.0.0 (R:\Rust\rust\src\bootstrap)
    Finished dev [unoptimized] target(s) in 3.15s
Documenting stage0 std (x86_64-pc-windows-msvc)
 Documenting core v0.0.0 (R:\Rust\rust\library\core)
    Finished release [optimized] target(s) in 36.42s
    Checking core v0.0.0 (R:\Rust\rust\library\core)
    Checking rustc-std-workspace-core v1.99.0 (R:\Rust\rust\library\rustc-std-workspace-core)
    Checking compiler_builtins v0.1.79
 Documenting alloc v0.0.0 (R:\Rust\rust\library\alloc)
error: unresolved link to `BTreeMap::bulk_build_from_sorted_iter`
 --> library\alloc\src\collections\btree\dedup_sorted_iter.rs:6:15
  |
6 | /// Used by [`BTreeMap::bulk_build_from_sorted_iter`].
  |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no item named `BTreeMap` in scope
  |
  = note: `-D rustdoc::broken-intra-doc-links` implied by `-D warnings`

error: could not document `alloc`
```

0 files changed, 0 insertions, 0 deletions