Rollup merge of rust-lang#81497 - camelid:rustdoc-display_fn-remove-cell, r=jyn514

rustdoc: Move `display_fn` struct inside `display_fn`

This makes it clear that it's an implementation detail of `display_fn`
and shouldn't be used elsewhere, and it enforces in the compiler that no
one else can use it.

r? ````@GuillaumeGomez````

Author: m-ou-se

src/librustdoc/html/format.rs

@@ -1331,16 +1331,16 @@ impl clean::GenericArg {
 }
 
 crate fn display_fn(f: impl FnOnce(&mut fmt::Formatter<'_>) -> fmt::Result) -> impl fmt::Display {
-    WithFormatter(Cell::new(Some(f)))
-}
-
-struct WithFormatter<F>(Cell<Option<F>>);
-
-impl<F> fmt::Display for WithFormatter<F>
-where
-    F: FnOnce(&mut fmt::Formatter<'_>) -> fmt::Result,
-{
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        (self.0.take()).unwrap()(f)
+    struct WithFormatter<F>(Cell<Option<F>>);
+
+    impl<F> fmt::Display for WithFormatter<F>
+    where
+        F: FnOnce(&mut fmt::Formatter<'_>) -> fmt::Result,
+    {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            (self.0.take()).unwrap()(f)
+        }
     }
+
+    WithFormatter(Cell::new(Some(f)))
 }