SDK-777 remove some comments

Author: echo-branch

Branch-SDK-Tests/BNCCallbackMapTests.m

@@ -31,7 +31,6 @@ - (void)tearDown {
 - (void)testSingleSave {
     BNCCallbackMap *map = [BNCCallbackMap new];
 
-    // block variable callback will update
     __block BOOL successResult = NO;
     __block NSString *statusMessageResult = @"no callback";
 
@@ -57,7 +56,6 @@ - (void)testSingleSave {
 - (void)testDeletedRequest {
     BNCCallbackMap *map = [BNCCallbackMap new];
 
-    // block variable callback will update
     __block BOOL successResult = NO;
     __block NSString *statusMessageResult = @"no callback";