Fix documentation

lib/concurrent-ruby/concurrent/executor/fixed_thread_pool.rb

@@ -16,6 +16,9 @@ module Concurrent
   #   Default maximum number of seconds a thread in the pool may remain idle
   #   before being reclaimed.
 
+  # @!macro thread_pool_executor_constant_default_synchronous
+  #   Default value of the :synchronous option.
+
   # @!macro thread_pool_executor_attr_reader_max_length
   #   The maximum number of threads that may be created in the pool.
   #   @return [Integer] The maximum number of threads that may be created in the pool.
@@ -40,6 +43,10 @@ module Concurrent
   #   The number of seconds that a thread may be idle before being reclaimed.
   #   @return [Integer] The number of seconds that a thread may be idle before being reclaimed.
 
+  # @!macro thread_pool_executor_attr_reader_synchronous
+  #   Whether or not a value of 0 for :max_queue option means the queue must perform direct hand-off or rather unbounded queue.
+  #   @return [true, false]
+
   # @!macro thread_pool_executor_attr_reader_max_queue
   #   The maximum number of tasks that may be waiting in the work queue at any one time.
   #   When the queue size reaches `max_queue` subsequent tasks will be rejected in

lib/concurrent-ruby/concurrent/executor/thread_pool_executor.rb

@@ -73,7 +73,7 @@ class ThreadPoolExecutor < ThreadPoolExecutorImplementation
     #   @option opts [Symbol] :fallback_policy (:abort) the policy for handling new
     #     tasks that are received when the queue size has reached
     #     `max_queue` or the executor has shut down
-    #   @options opts [Boolean] :synchronous (DEFAULT_SYNCHRONOUS) whether or not a value of 0
+    #   @option opts [Boolean] :synchronous (DEFAULT_SYNCHRONOUS) whether or not a value of 0
     #     for :max_queue means the queue must perform direct hand-off rather than unbounded.
     #   @raise [ArgumentError] if `:max_threads` is less than one
     #   @raise [ArgumentError] if `:min_threads` is less than zero