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

Add CI test for documentation of hidden items in std

Fixes rust-lang#87844

r? `@jyn514`

Author: bors

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]