[Bug] should trim_end in collect_title_in_mdast when generate toc

[Timeless0911]

If the heading contains some mdx component like

### `font-weight` <Version22 />

The mdx_plugin_toc will return a string contains whitespace at the end

mdx-rs/crates/plugin_toc/src/lib.rs

Lines 61 to 87 in 4b27c47

	pub fn collect_title_in_mdast(heading: &mut Heading) -> (String, String) {
	let mut title = String::new();
	let mut custom_id = String::new();
	for child in &mut heading.children {
	match child {
	mdast::Node::Text(text) => {
	// example: hello world {#custom-id}
	// Then we extract the `hello world` as title and `custom-id` as id
	let (title_part, id_part) = extract_title_and_id(&text.value);
	title.push_str(&title_part);
	custom_id = id_part;
	}
	mdast::Node::Strong(_) => {
	title.push_str(format!("**{}**", extract_text_from_node(child, NodeType::Strong)).as_str())
	}
	mdast::Node::Emphasis(_) => {
	title.push_str(format!("*{}*", extract_text_from_node(child, NodeType::Emphasis)).as_str())
	}
	mdast::Node::InlineCode(code) => title.push_str(format!("`{}`", code.value).as_str()),
	mdast::Node::Link(_) => {
	title.push_str(extract_text_from_node(child, NodeType::Link).as_str())
	}
	_ => continue, // Continue if node is not Text or Code
	}
	}
	(title, custom_id)
	}