Three minor clarifications (#25621)

## Description

Fix three minor code readability issues.

Author: CraigMacomber

packages/drivers/local-driver/src/localCreateDocument.ts

@@ -17,7 +17,7 @@ export async function createDocument(
 	localDeltaConnectionServer,
 	resolvedUrl: IResolvedUrl,
 	summary: ISummaryTree,
-) {
+): Promise<void> {
 	const pathName = new URL(resolvedUrl.url).pathname;
 	const pathArr = pathName.split("/");
 	// TODO Why are we non null asserting here

packages/test/test-utils/src/loaderContainerTracker.ts

@@ -25,7 +25,7 @@ import { canBeCoalescedByService } from "@fluidframework/driver-utils/internal";
 import { toIDeltaManagerFull, waitForContainerConnection } from "./containerUtils.js";
 import { debug } from "./debug.js";
 import { isNonEmptyArray, type NonEmptyArray } from "./nonEmptyArrayType.js";
-import { IOpProcessingController } from "./testObjectProvider.js";
+import type { IOpProcessingController } from "./testObjectProvider.js";
 import { timeoutAwait, timeoutPromise } from "./timeoutUtils.js";
 
 const debugOp = debug.extend("ops");
@@ -240,7 +240,7 @@ export class LoaderContainerTracker implements IOpProcessingController {
 				break;
 			}
 
-			// Ignore readonly dirty containers, because it can't sent ops and nothing can be done about it being dirty
+			// Ignore readonly dirty containers because they can't send ops and nothing can be done about them being dirty.
 			const dirtyContainers = containersToApply.filter((c) => {
 				const { deltaManager, isDirty } = c;
 				return deltaManager.readOnlyInfo.readonly !== true && isDirty;