Add few comments

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

src/plugins/visualizations/public/embeddable/visualize_embeddable.ts

@@ -405,6 +405,10 @@ export class VisualizeEmbeddable
     const abortController = this.abortController;
 
     let exprVisLayers = {} as ExprVisLayers;
+    // TODO: final eligibility will be defined as part of a separate effort.
+    // This includes not fetching any layers / not showing any layers, when in the
+    // edit context of the vis
+    // See https://github.com/opensearch-project/OpenSearch-Dashboards/issues/3268
     if (isEligibleForVisLayers(this.vis)) {
       exprVisLayers = await this.fetchVisLayers(expressionParams, abortController);
     }
@@ -485,7 +489,8 @@ export class VisualizeEmbeddable
 
   /**
    * Collects any VisLayers from plugin expressions functions
-   * by fetching all AugmentVisSavedObjects that match the vis ID
+   * by fetching all AugmentVisSavedObjects that match the vis
+   * saved object ID
    */
   fetchVisLayers = async (
     expressionParams: IExpressionLoaderParams,
@@ -498,6 +503,8 @@ export class VisualizeEmbeddable
     );
     if (!isEmpty(augmentVisSavedObjs) && !abortController.signal.aborted) {
       const visLayersPipeline = buildPipelineFromAugmentVisSavedObjs(augmentVisSavedObjs);
+      // The initial input for the pipeline will just be an empty arr of VisLayers. As plugin
+      // expression functions are ran, they will incrementally append their generated VisLayers to it.
       const visLayersPipelineInput = {
         type: 'vis_layers',
         layers: [] as VisLayers,