Merge pull request #16075 from nickpellant/master

Fix ActiveSupport::Callbacks #set_callback docs.

activesupport/lib/active_support/callbacks.rb

@@ -566,7 +566,7 @@ def __update_callbacks(name) #:nodoc:
       #
       #   set_callback :save, :before, :before_meth
       #   set_callback :save, :after,  :after_meth, if: :condition
-      #   set_callback :save, :around, ->(r, &block) { stuff; result = block.call; stuff }
+      #   set_callback :save, :around, ->(r, block) { stuff; result = block.call; stuff }
       #
       # The second arguments indicates whether the callback is to be run +:before+,
       # +:after+, or +:around+ the event. If omitted, +:before+ is assumed. This