Context::metadata_string doc example returns an error

[DaniPopes]

Describe the Bug
Context::metadata_string doc example returns "metadata is expected to be a node.", due to calling InstructionValue::set_metadata

To Reproduce

inkwell/src/context.rs

Lines 1970 to 2001 in 69c5a3f

	/// Creates a `MetadataValue` string for the current context. It can be assigned to a value.
	///
	/// # Example
	///
	/// ```no_run
	/// use inkwell::context::Context;
	///
	/// let context = Context::create();
	/// let md_string = context.metadata_string("Floats are awesome!");
	/// let f32_type = context.f32_type();
	/// let f32_one = f32_type.const_float(1.);
	/// let void_type = context.void_type();
	///
	/// let builder = context.create_builder();
	/// let module = context.create_module("my_mod");
	/// let fn_type = void_type.fn_type(&[f32_type.into()], false);
	/// let fn_value = module.add_function("my_func", fn_type, None);
	/// let entry_block = context.append_basic_block(fn_value, "entry");
	///
	/// builder.position_at_end(entry_block);
	///
	/// let ret_instr = builder.build_return(None).unwrap();
	///
	/// assert!(md_string.is_string());
	///
	/// ret_instr.set_metadata(md_string, 0);
	/// ```
	// REVIEW: Seems to be unassigned to anything
	#[inline]
	pub fn metadata_string(&self, string: &str) -> MetadataValue<'ctx> {
	self.context.metadata_string(string)
	}

Expected Behavior
A working example

LLVM Version (please complete the following information):

• LLVM Version: 17.0
• Inkwell Branch Used: llvm17-0

Desktop (please complete the following information):

• OS: N/A

Additional Context
Opened an issue since I don't know how to fix it myself (: