### Godot version

4.0.beta13 (caacade56)

### System information

Windows 10

### Issue description

Seems like this was missed in #62011 and #70540. `@export_multiline` should also support the PackedStringArray datatype on top of Array[String] and Dictionary, but it doesn't, instead giving the error `"@export_multiline" annotation requires a variable of type "String" but type "PackedStringArray" was given instead.`

### Steps to reproduce

Create a PackedStringArray with the `@export_multiline` annotation.
```gdscript
@export_multiline var npc_dialog: PackedStringArray
```

### Minimal reproduction project

N/A
BRIEF,
		DESC,
		TUTORIALS,
		DONE,
	};
	Mode mode = BRIEF;
	if (p_inner_class) {
		while (comments.has(line - 1)) {
			if (!comments[line - 1].new_line || !comments[line - 1].comment.begins_with("##")) {
				break;
			}
			line--;
		}
	}
	int codeblock_begins = 0;
	while (comments.has(line)) {
		if (!comments[line].new_line || !comments[line].comment.begins_with("##")) {
			break;
		}
		String title, link; 
		String doc_line = comments[line++].comment.trim_prefix("##");
		String stripped_line = doc_line.strip_edges();
		
		if (stripped_line.is_empty() && mode == BRIEF && !p_brief.is_empty()) {
			mode = DESC;
			continue;
		} else if (stripped_line.begins_with("@tutorial")) {