The Timeout::Error example no longer works consistently

* This PR from the timeout gem (https://github.com/ruby/timeout/pull/30) made it so you have to handle_interrupt on Timeout::ExitException instead of Timeout::Error

* Efficiency changes to the gem (one shared thread) mean you can't consistently handle timeout errors using handle_timeout: https://github.com/ruby/timeout/issues/41

thread.c

@@ -2215,30 +2215,6 @@ handle_interrupt_arg_check_i(VALUE key, VALUE val, VALUE args)
  * resource allocation code. Then, the ensure block is where we can safely
  * deallocate your resources.
  *
- * ==== Guarding from Timeout::Error
- *
- * In the next example, we will guard from the Timeout::Error exception. This
- * will help prevent from leaking resources when Timeout::Error exceptions occur
- * during normal ensure clause. For this example we use the help of the
- * standard library Timeout, from lib/timeout.rb
- *
- *   require 'timeout'
- *   Thread.handle_interrupt(Timeout::Error => :never) {
- *     timeout(10){
- *       # Timeout::Error doesn't occur here
- *       Thread.handle_interrupt(Timeout::Error => :on_blocking) {
- *         # possible to be killed by Timeout::Error
- *         # while blocking operation
- *       }
- *       # Timeout::Error doesn't occur here
- *     }
- *   }
- *
- * In the first part of the +timeout+ block, we can rely on Timeout::Error being
- * ignored. Then in the <code>Timeout::Error => :on_blocking</code> block, any
- * operation that will block the calling thread is susceptible to a
- * Timeout::Error exception being raised.
- *
  * ==== Stack control settings
  *
  * It's possible to stack multiple levels of ::handle_interrupt blocks in order