### Godot version

4.0 beta 16 and 17

### System information

Windows 11

### Issue description

Before beta 16 you could write `@export_category(name)` and it would make a category with "name" as the name.
Now you must use a string when defining the category name. (`@export_category("name")`)
The issue is that the moment you type something that doesn't start with `"` the engine crashes.

### Steps to reproduce

1. Create a script.
2. Write one of the following:
a) `@export_category()`
b) `@export_group()`
c) `@export_subgroup()`
3. In the parentheses write *any* character other than `"`.
4. Watch it crash.

If you managed to save the file the project will crash when opened.

### Minimal reproduction project

[Minimal.zip](https://github.com/godotengine/godot/files/10561826/Minimal.zip)

}
				if (colon_pos == stripped_line.length() || stripped_line[colon_pos++] != ':') {
					continue; 
				}
				title = stripped_line.substr(open_bracket_pos, close_bracket_pos - open_bracket_pos).strip_edges();
				link = stripped_line.substr(colon_pos).strip_edges();
			}
			mode = TUTORIALS;
			in_codeblock = false;
		} else if (stripped_line.is_empty()) {
			continue;
		} else {
			
			if (mode == TUTORIALS) {
				mode = DONE;
			}
			in_codeblock = _in_codeblock(doc_line, in_codeblock, &codeblock_begins);
		}
		if (in_codeblock) {
			int i = 0;
			for (; i < codeblock_begins; i++) {
				if (doc_line[i] != ' ') {
					break;
				}
			}
			doc_line = doc_line.substr(i);
		} else {
			doc_line = stripped_line;
		}
		String line_join = (in_codeblock) ? "\n" : " ";