### Godot version

4.0 stable

### System information

Fedora, RX 590

### Issue description

I made a dictionary, and instead of using `:` to separate between key and value, i accidentally used `=`.
The error message was not clear at all `Parse Error: Expected identifier or string as LUA-style dictionary key.` 

I don't think assuming that people know how dictionaries are made in LUA is reasonable. And if this is not about LUA the programming language, i don't even know what this is about :D

I think this error should be replaced with something of the sort "Please use `:` as separator instead of `=` in your dictionary"

### Steps to reproduce

Paste this code in a script:

```

var dict = {
	1 = "lala"
}
```

Observe the error message
![image](https://user-images.githubusercontent.com/7917475/224549538-38ea25aa-ba75-431e-868b-0733a53b90ad.png)


### Minimal reproduction project

see above
if (class_type->identifier != nullptr) {
				return class_type->identifier->name.operator String();
			}
			return class_type->fqcn;
		case SCRIPT: {
			if (is_meta_type) {
				return script_type != nullptr ? script_type->get_class_name().operator String() : "";
			}
			String name = script_type != nullptr ? script_type->get_name() : "";
			if (!name.is_empty()) {
				return name;
			}
			name = script_path;
			if (!name.is_empty()) {
				return name;
			}
			return native_type.operator String();
		}
		case ENUM: {
			
			
			return String(native_type).get_file(); 
		}
		case RESOLVING:
		case UNRESOLVED:
			return "<unresolved type>";
	}
	ERR_FAIL_V_MSG("<unresolved type>", "Kind set outside the enum range.");
}
static Variant::Type _variant_type_to_typed_array_element_type(Variant::Type p_type) {