Auto merge of #105794 - ChrisDenton:internal-doc, r=jyn514

Add CI test for documentation of hidden items in std

Fixes #87844

r? `@jyn514`

Author: bors

library/core/src/fmt/mod.rs

@@ -405,7 +405,7 @@ impl<'a> Arguments<'a> {
     /// 1. The `pieces` slice must be at least as long as `fmt`.
     /// 2. Every [`rt::v1::Argument::position`] value within `fmt` must be a
     ///    valid index of `args`.
-    /// 3. Every [`Count::Param`] within `fmt` must contain a valid index of
+    /// 3. Every [`rt::v1::Count::Param`] within `fmt` must contain a valid index of
     ///    `args`.
     #[doc(hidden)]
     #[inline]

src/ci/docker/host-x86_64/mingw-check/Dockerfile

@@ -46,7 +46,7 @@ ENV SCRIPT python3 ../x.py --stage 2 test src/tools/expand-yaml-anchors && \
            python3 ../x.py test --stage 2 src/tools/tidy && \
            python3 ../x.py test --stage 0 core alloc std test proc_macro && \
            # Build both public and internal documentation.
-           RUSTDOCFLAGS="--document-private-items" python3 ../x.py doc --stage 0 library/test && \
+           RUSTDOCFLAGS=\"--document-private-items --document-hidden-items\" python3 ../x.py doc --stage 0 library/test && \
            /scripts/validate-toolstate.sh && \
            /scripts/validate-error-codes.sh && \
            reuse lint && \