Rollup merge of #117270 - jhpratt:hide-print-internals, r=ChrisDenton

Hide internal methods from documentation

The two methods here are perma-unstable and only made public for technical reasons. There is no reason to show them in documentation.

`@rustbot` label +A-docs

library/std/src/io/mod.rs

@@ -317,6 +317,7 @@ pub use self::stdio::set_output_capture;
 #[stable(feature = "is_terminal", since = "1.70.0")]
 pub use self::stdio::IsTerminal;
 #[unstable(feature = "print_internals", issue = "none")]
+#[doc(hidden)]
 pub use self::stdio::{_eprint, _print};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::{