Fix some typos in ActiveJob

[ci skip]

activejob/lib/active_job/queue_adapters/qu_adapter.rb

@@ -6,7 +6,7 @@ module QueueAdapters
     #
     # Qu is a Ruby library for queuing and processing background jobs. It is
     # heavily inspired by delayed_job and Resque. Qu was created to overcome
-    # some shortcomings in the existing queuing libraries that we experienced.
+    # some shortcomings in the existing queuing libraries.
     # The advantages of Qu are: Multiple backends (redis, mongo), jobs are
     # requeued when worker is killed, resque-like API.
     #

activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb

@@ -34,7 +34,7 @@ def enqueue_at(job, timestamp) #:nodoc:
 
         # Builds a <tt>QC::Queue</tt> object to schedule jobs on.
         #
-        # If you have a custom <tt>QC::Queue</tt> subclass you'll need to suclass
+        # If you have a custom <tt>QC::Queue</tt> subclass you'll need to subclass
         # <tt>ActiveJob::QueueAdapters::QueueClassicAdapter</tt> and override the
         # <tt>build_queue</tt> method.
         def build_queue(queue_name)