"cargo doc" contains untested examples

[loloicci]

cw-into-event/src/lib.rs

Lines 51 to 83 in a713482

	/// Structure:
	///
	/// ```ignore
	/// #[derive(IntoEvent)]
	/// struct MyStruct {
	/// field1: type1,
	/// // if the value's type does not implement `Into<String>` trait
	/// // and it implements `ToString` trait, programmers can specify
	/// // to use `field1.to_string()` to get string
	/// // by applying `use_to_string`.
	/// #[use_to_string]
	/// field2: type2,
	/// // if the value's type does not implement both `Into<String>` and
	/// // `ToString` traits, programmers need specify a function
	/// // to get string with `casting_fn(field3)` by applying
	/// // `to_string_fn(casting_fn)` attribute.
	/// // this `casting_fn` needs to have the type `type3 -> String`.
	/// #[to_string_fn(casting_fn)]
	/// field3: type3,
	/// }
	/// ```
	///
	/// Output AST:
	///
	/// ```ignore
	/// impl Into<cosmwasm_std::Event> for MyStruct {
	/// fn into(self) -> cosmwasm_std::Event {
	/// cosmwasm_std::Event::new("my_struct")
	/// .add_attribute("field1", self.field1)
	/// .add_attribute("field2", self.field2.to_string())
	/// .add_attribute("field3", casting_fn(self.field3))
	/// }
	/// }

These examples are specified as ignore and issue warnings in the doc.

As #2 (comment), I think there is no problem, but should write why this has warnings.