docs: Add link to usage example to `State` docs
@@ -9,6 +9,8 @@ use crate::{
use state::Container;
/// A guard for a state value.
+///
+/// See [`Manager::manage`](`crate::Manager::manage`) for usage examples.
pub struct State<'r, T: Send + Sync + 'static>(&'r T);
impl<'r, T: Send + Sync + 'static> State<'r, T> {
