Change Wording in diff leak instruction (#130)

Summary:
The wording seemed off to me while using so I wanted to propose a change here.

Pull Request resolved: #130

Differential Revision: D65675409

Pulled By: JacksonGL

fbshipit-source-id: e46f9fdd0a89fb112eafaa59c9a06e0a880f7f72

packages/cli/src/commands/heap/DiffLeakCommand.ts

@@ -100,10 +100,10 @@ export default class CheckLeakCommand extends BaseCommand {
     throw utils.haltOrThrow(
       'No control or test working directory or snapshot location specified, ' +
         'please specify them via: \n' +
-        ` --${new SetControlSnapshotOption().getOptionName()} with ` +
+        ` --${new SetControlSnapshotOption().getOptionName()} and` +
         ` --${new SetTreatmentSnapshotOption().getOptionName()}\n` +
         'alternatively, you can also specify them via: \n' +
-        ` --${new SetControlWorkDirOption().getOptionName()} with ` +
+        ` --${new SetControlWorkDirOption().getOptionName()} and` +
         ` --${new SetTreatmentWorkDirOption().getOptionName()}`,
     );
   }