docs: io types' getter docs mentions "sink or stream", but it is reader or writer

[taiki-e]

https://docs.rs/futures/latest/futures/io/struct.Take.html#method.get_ref

Acquires a reference to the underlying sink or stream that this combinator is pulling from.

These methods are defined by the delegate_access_inner macro and we need to fix that macro.

futures-rs/futures-util/src/io/take.rs

Line 81 in 0f83c20

delegate_access_inner!(inner, R, ());

futures-rs/futures-util/src/lib.rs

Lines 183 to 217 in 0f83c20

	macro_rules! delegate_access_inner {
	($field:ident, $inner:ty, ($($ind:tt)*)) => {
	/// Acquires a reference to the underlying sink or stream that this combinator is
	/// pulling from.
	pub fn get_ref(&self) -> &$inner {
	(&self.$field) $($ind get_ref())*
	}
	/// Acquires a mutable reference to the underlying sink or stream that this
	/// combinator is pulling from.
	///
	/// Note that care must be taken to avoid tampering with the state of the
	/// sink or stream which may otherwise confuse this combinator.
	pub fn get_mut(&mut self) -> &mut $inner {
	(&mut self.$field) $($ind get_mut())*
	}
	/// Acquires a pinned mutable reference to the underlying sink or stream that this
	/// combinator is pulling from.
	///
	/// Note that care must be taken to avoid tampering with the state of the
	/// sink or stream which may otherwise confuse this combinator.
	pub fn get_pin_mut(self: core::pin::Pin<&mut Self>) -> core::pin::Pin<&mut $inner> {
	self.project().$field $($ind get_pin_mut())*
	}
	/// Consumes this combinator, returning the underlying sink or stream.
	///
	/// Note that this may discard intermediate state of this combinator, so
	/// care should be taken to avoid losing resources when this is called.
	pub fn into_inner(self) -> $inner {
	self.$field $($ind into_inner())*
	}
	}
	}