Merge pull request #40984 from alecclarke/update-active-support-rescu…

…able-docs

Clarify use of rescue_from [ci skip]

activesupport/lib/active_support/rescuable.rb

@@ -14,12 +14,12 @@ module Rescuable
     end
 
     module ClassMethods
-      # Rescue exceptions raised in controller actions.
+      # Registers exception classes with a handler to be called by <tt>rescue_with_handler</tt>.
       #
       # <tt>rescue_from</tt> receives a series of exception classes or class
-      # names, and a trailing <tt>:with</tt> option with the name of a method
-      # or a Proc object to be called to handle them. Alternatively a block can
-      # be given.
+      # names, and an exception handler specified by a trailing <tt>:with</tt>
+      # option containing the name of a method or a Proc object. Alternatively, a block
+      # can be given as the handler.
       #
       # Handlers that take one argument will be called with the exception, so
       # that the exception can be inspected when dealing with it.