### Godot version

3.5.1.stable, v4.0.beta.custom_build [0a87ead64]

### System information

Ubuntu 22.04.1

### Issue description

For example, if project has name "300spartans", we can't enter the "org.godotengine.300spartans" to "Unique Name" field. We get the error "Invalid package name: A digit cannot be the first character in a package segment". But , if we enter "org.godotengine.$genname", there will be no error message. When exporting, the name will be set as "org.godotengine.spartans" without "300" in beginning, but user will not be informed about it. I think, it is not very good. It may not be worth making changes to the source code, but mention it in the documentation.

### Steps to reproduce

See issue description.

### Minimal reproduction project

N/A
}
			if (different) {
				Vector<Device> ndevices;
				for (int i = 0; i < ldevices.size(); i++) {
					Device d;
					d.id = ldevices[i];
					for (int j = 0; j < ea->devices.size(); j++) {
						if (ea->devices[j].id == ldevices[i]) {
							d.description = ea->devices[j].description;
							d.name = ea->devices[j].name;
							d.api_level = ea->devices[j].api_level;
						}
					}
					if (d.description.is_empty()) {
						
						args.clear();
						args.push_back("-s");
						args.push_back(d.id);
						args.push_back("shell");
						args.push_back("getprop");
						int ec2;
						String dp;
						OS::get_singleton()->execute(adb, args, &dp, &ec2);
						Vector<String> props = dp.split("\n");
						String vendor;
						String device;
						d.description = "Device ID: " + d.id + "\n";
						d.api_level = 0;
						for (int j = 0; j < props.size(); j++) {