### 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
}
		}
	}
}
void EditorExportPlatformAndroid::_write_tmp_manifest(const Ref<EditorExportPreset> &p_preset, bool p_give_internet, bool p_debug) {
	print_verbose("Building temporary manifest...");
	String manifest_text =
			"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
			"<manifest xmlns:android=\"http://schemas.android.com/apk/res/android\"\n"
			"    xmlns:tools=\"http://schemas.android.com/tools\">\n";
	manifest_text += _get_screen_sizes_tag(p_preset);
	manifest_text += _get_gles_tag();
	Vector<String> perms;
	_get_permissions(p_preset, p_give_internet, perms);
	for (int i = 0; i < perms.size(); i++) {
		String permission = perms.get(i);
		if (permission == "android.permission.WRITE_EXTERNAL_STORAGE" || (permission == "android.permission.READ_EXTERNAL_STORAGE" && _has_manage_external_storage_permission(perms))) {
			manifest_text += vformat("    <uses-permission android:name=\"%s\" android:maxSdkVersion=\"29\" />\n", permission);
		} else {
			manifest_text += vformat("    <uses-permission android:name=\"%s\" />\n", permission);
		}
	}
	manifest_text += _get_xr_features_tag(p_preset);
	manifest_text += _get_application_tag(p_preset, _has_read_write_storage_permission(perms));
	manifest_text += "</manifest>\n";
	String manifest_path = vformat("res://android/build/src/%s/AndroidManifest.xml", (p_debug ? "debug" : "release"));
	print_verbose("Storing manifest into " + manifest_path + ": " + "\n" + manifest_text);
	store_string_at_path(manifest_path, manifest_text);
}
void EditorExportPlatformAndroid::_fix_manifest(const Ref<EditorExportPreset> &p_preset, Vector<uint8_t> &p_manifest, bool p_give_internet) {