- Fix mentioned shortcut, to what the shortcut actually is, and that …

…it accepts blocks for `assert_no_enqueued_jobs` and `assert_no_performed_jobs` test helpers.

- args => arguments when used in actual docs.

[ci skip]

activejob/lib/active_job/enqueuing.rb

@@ -10,7 +10,7 @@ module ClassMethods
       # GlobalID::Identification instances. Arbitrary Ruby objects
       # are not supported.
       #
-      # Returns an instance of the job class queued with args available in
+      # Returns an instance of the job class queued with arguments available in
       # Job#arguments.
       def perform_later(*args)
         job_or_instantiate(*args).enqueue

activejob/lib/active_job/test_helper.rb

@@ -71,7 +71,7 @@ def assert_enqueued_jobs(number)
       #
       # Note: This assertion is simply a shortcut for:
       #
-      #   assert_enqueued_jobs 0
+      #   assert_enqueued_jobs 0, &block
       def assert_no_enqueued_jobs(&block)
         assert_enqueued_jobs 0, &block
       end
@@ -130,7 +130,7 @@ def assert_performed_jobs(number)
       #
       # Note: This assertion is simply a shortcut for:
       #
-      #   assert_performed_jobs 0
+      #   assert_performed_jobs 0, &block
       def assert_no_performed_jobs(&block)
         assert_performed_jobs 0, &block
       end