Fix typo "rescured" to "rescued"

Author: hsbt

test/ruby/test_thread.rb

@@ -798,7 +798,7 @@ def test_handle_interrupt_invalid_argument
 
   def for_test_handle_interrupt_with_return
     Thread.handle_interrupt(Object => :never){
-      Thread.current.raise RuntimeError.new("have to be rescured")
+      Thread.current.raise RuntimeError.new("have to be rescued")
       return
     }
   rescue
@@ -815,7 +815,7 @@ def test_handle_interrupt_with_break
     assert_nothing_raised do
       begin
         Thread.handle_interrupt(Object => :never){
-          Thread.current.raise RuntimeError.new("have to be rescured")
+          Thread.current.raise RuntimeError.new("have to be rescued")
           break
         }
       rescue