fix comment

Co-authored-by: Alice Cecile <[email protected]>

Author: kurtkuehnert

crates/bevy_render/src/render_phase/draw_state.rs

@@ -172,7 +172,7 @@ impl<'a> TrackedRenderPass<'a> {
     /// Subsequent calls to [`draw`] and [`draw_indexed`] on this
     /// [`RenderPass`] will use `buffer` as one of the source vertex buffers.
     ///
-    /// The `slot` refers to the index of the matching descriptor in
+    /// The `slot_index` refers to the index of the matching descriptor in
     /// [`VertexState::buffers`](crate::render_resource::VertexState::buffers).
     ///
     /// [`draw`]: TrackedRenderPass::draw