Improve linking within RenderSet docs. (bevyengine#10143)

# Objective

- Improve formatting and linking within `RenderSet` docs.

## Solution

- Used backticks and intradoc links.

crates/bevy_render/src/lib.rs

@@ -92,19 +92,19 @@ pub enum RenderSet {
     /// Queue drawable entities as phase items in [`RenderPhase`](crate::render_phase::RenderPhase)s
     /// ready for sorting
     Queue,
-    /// A sub-set within Queue where mesh entity queue systems are executed. Ensures `prepare_assets::<Mesh>` is completed.
+    /// A sub-set within [`Queue`](RenderSet::Queue) where mesh entity queue systems are executed. Ensures `prepare_assets::<Mesh>` is completed.
     QueueMeshes,
-    // TODO: This could probably be moved in favor of a system ordering abstraction in Render or Queue
+    // TODO: This could probably be moved in favor of a system ordering abstraction in `Render` or `Queue`
     /// Sort the [`RenderPhases`](render_phase::RenderPhase) here.
     PhaseSort,
     /// Prepare render resources from extracted data for the GPU based on their sorted order.
     /// Create [`BindGroups`](crate::render_resource::BindGroup) that depend on those data.
     Prepare,
-    /// A sub-set within Prepare for initializing buffers, textures and uniforms for use in bind groups.
+    /// A sub-set within [`Prepare`](RenderSet::Prepare) for initializing buffers, textures and uniforms for use in bind groups.
     PrepareResources,
     /// The copy of [`apply_deferred`] that runs between [`PrepareResources`](RenderSet::PrepareResources) and ['PrepareBindGroups'](RenderSet::PrepareBindGroups).
     PrepareResourcesFlush,
-    /// A sub-set within Prepare for constructing bind groups, or other data that relies on render resources prepared in [`PrepareResources`](RenderSet::PrepareResources).
+    /// A sub-set within [`Prepare`](RenderSet::Prepare) for constructing bind groups, or other data that relies on render resources prepared in [`PrepareResources`](RenderSet::PrepareResources).
     PrepareBindGroups,
     /// The copy of [`apply_deferred`] that runs immediately after [`Prepare`](RenderSet::Prepare).
     PrepareFlush,
@@ -127,7 +127,7 @@ impl Render {
     /// Sets up the base structure of the rendering [`Schedule`].
     ///
     /// The sets defined in this enum are configured to run in order,
-    /// and a copy of [`apply_deferred`] is inserted into each `*Flush` set.
+    /// and a copy of [`apply_deferred`] is inserted into each [`*Flush` set](RenderSet).
     pub fn base_schedule() -> Schedule {
         use RenderSet::*;