Document requirement for explicit default in Enum properties

When using the `Property` macro with enum types that derive `Enum`, the
default value must be explicitly set using `#[property(builder(...))]`.

Author: nozwock

glib-macros/src/lib.rs

@@ -525,32 +525,30 @@ pub fn closure_local(item: TokenStream) -> TokenStream {
 /// }
 /// ```
 ///
-/// When using [`glib::Properties`] with an enum that derives [`glib::Enum`], the
-/// default value must be explicitly set via the `builder` parameter of the
+/// When using [`Properties`] with an enum that derives [`Enum`], the default
+/// value must be explicitly set via the `builder` parameter of the
 /// `#[property]` attribute.
 ///
-/// # Example
-///
-/// ```
+/// ```ignore
 /// use glib::prelude::*;
 /// use glib::subclass::prelude::*;
 ///
 /// #[derive(Debug, Copy, Clone, PartialEq, Eq, glib::Enum)]
 /// #[enum_type(name = "MyEnum")]
 /// enum MyEnum {
 ///     Val,
-///     ...
+///     // ...
 /// }
 ///
 /// mod imp {
 ///     use std::cell::Cell;
 ///
 ///     #[derive(Debug, Default, glib::Properties)]
-///     #[properties(wrapper_type = super::MyObject)
+///     #[properties(wrapper_type = super::MyObject)]
 ///     pub MyObject {
 ///         #[property(get, set, builder(MyEnum::Val))]
 ///         my_enum: Cell<MyEnum>,
-///         ...
+///         // ...
 ///     }
 /// }
 /// ```