* error.c: RDoc for subclasses of Exception. [ruby-core:28394]

* cont.c: ditto

* enumerator.c: ditto

* io.c: ditto

* math.c: ditto

* numeric.c: ditto

* proc.c: ditto

* re.c: ditto

* thread.c: ditto

* transcode.c: ditto. Thanks to Run Paint for some of the documentation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@27673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

thread.c

@@ -4126,6 +4126,20 @@ rb_thread_backtrace_m(VALUE thval)
     return rb_thread_backtrace(thval);
 }
 
+/*
+ *  Document-class: ThreadError
+ *
+ *  Raised when an invalid operation is attempted on a thread.
+ *
+ *  For example, when no other thread has been started:
+ *
+ *     Thread.stop
+ *
+ *  <em>raises the exception:</em>
+ *
+ *     ThreadError: stopping only thread
+ */
+
 /*
  *  +Thread+ encapsulates the behavior of a thread of
  *  execution, including the main thread of the Ruby script.