Update TODO documentation around parsing

Change-Id: I14fb4874fdc3e97418b5f41665334e122c17d862

includes/Hooks/DataUpdatesHooks.php

@@ -38,7 +38,8 @@ class DataUpdatesHooks implements RevisionDataUpdatesHook {
 		// This doesn't trigger on action=purge, only on automatic purge after editing a template or
 		// transcluded page, and API action=purge&forcelinkupdate=1.
 
-		// TODO Deduplicate work between this and the Echo hook (make it use Parsoid too)
+		// TODO: Deduplicate the thread-item-processing done here with the Echo hook
+		// (which thread-item-processes the current and previous revisions).
 		$rev = $renderedRevision->getRevision();
 		if ( HookUtils::isAvailableForTitle( $title ) ) {
 			$method = __METHOD__;

includes/Notifications/EventDispatcher.php

@@ -57,6 +57,7 @@ class EventDispatcher {
 
 		// If the $revRecord was fetched from the primary database, this will also fetch the content
 		// from the primary database (using the same query flags)
+		// TODO: Fetch HTML from Parsoid, as we do in onRevisionDataUpdates.
 		$status = $services->getParserOutputAccess()->getParserOutput(
 			$pageRecord,
 			ParserOptions::newFromAnon(),