fix namings and comments

Author: ievdokdm

app_dart/lib/src/service/firestore/unified_check_run.dart

@@ -43,7 +43,7 @@ final class UnifiedCheckRun {
       );
       // We store the creation time of the guard since there might be several
       // guards for the same PR created and each new one created after previous
-      // was succeeded so we are interested in a state of the last one.
+      // was succeeded so we are interested in a state of the latest one.
       final creationTime = DateTime.now().toUtc().microsecondsSinceEpoch;
       final guard = PresubmitGuard(
         checkRun: checkRun,
@@ -94,8 +94,8 @@ final class UnifiedCheckRun {
     final transaction = await firestoreService.beginTransaction();
 
     // New guard created only if previous is succeeded so failed checks might be
-    // only in last guard.
-    final guard = await getLastPresubmitGuardForCheckRun(
+    // only in latest guard.
+    final guard = await getLatestPresubmitGuardForCheckRun(
       firestoreService: firestoreService,
       slug: slug,
       pullRequestId: pullRequestId,
@@ -192,7 +192,7 @@ final class UnifiedCheckRun {
     )).firstOrNull;
   }
 
-  /// Returns the latest check for the specified github [checkRunId] and
+  /// Returns the latest [PresubmitCheck] for the specified github [checkRunId] and
   /// [buildName].
   static Future<PresubmitCheck?> getLatestPresubmitCheck({
     required FirestoreService firestoreService,
@@ -210,8 +210,8 @@ final class UnifiedCheckRun {
     )).firstOrNull;
   }
 
-  /// Returns [PresubmitGuard]s for the specified github [checkRunId].
-  static Future<PresubmitGuard?> getLastPresubmitGuardForCheckRun({
+  /// Returns the latest [PresubmitGuard] for the specified github [checkRunId].
+  static Future<PresubmitGuard?> getLatestPresubmitGuardForCheckRun({
     required FirestoreService firestoreService,
     required RepositorySlug slug,
     required int pullRequestId,

app_dart/test/service/firestore/unified_check_run_test.dart

@@ -484,7 +484,7 @@ void main() {
       });
     });
 
-    test('getLastPresubmitGuardForCheckRun returns newest guard', () async {
+    test('getLatestPresubmitGuardForCheckRun returns latest guard', () async {
       final sha = 'sha';
       final slug = RepositorySlug('flutter', 'flutter');
       final checkRun = CheckRun.fromJson(const {
@@ -527,7 +527,7 @@ void main() {
         ], exists: false),
       );
 
-      final guard = await UnifiedCheckRun.getLastPresubmitGuardForCheckRun(
+      final guard = await UnifiedCheckRun.getLatestPresubmitGuardForCheckRun(
         firestoreService: firestoreService,
         slug: slug,
         pullRequestId: 1,