Fix link to states example (#17595)

Fixes the link to the states example.

Co-authored-by: Rob Parrett <[email protected]>

crates/bevy_state/src/lib.rs

@@ -6,7 +6,7 @@
 //!
 //! - Standard [`States`](state::States) can only be changed by manually setting the [`NextState<S>`](state::NextState) resource.
 //!   These states are the baseline on which the other state types are built, and can be used on
-//!   their own for many simple patterns. See the [state example](https://github.com/bevyengine/bevy/blob/latest/examples/state/state.rs)
+//!   their own for many simple patterns. See the [states example](https://github.com/bevyengine/bevy/blob/latest/examples/state/states.rs)
 //!   for a simple use case.
 //! - [`SubStates`](state::SubStates) are children of other states - they can be changed manually using [`NextState<S>`](state::NextState),
 //!   but are removed from the [`World`](bevy_ecs::prelude::World) if the source states aren't in the right state. See the [sub_states example](https://github.com/bevyengine/bevy/blob/latest/examples/state/sub_states.rs)