thread_sync.c: fix rdoc
thread_sync.c (define_thread_class): hide rb_define_class_under from rdoc, so that fake code to teach rdoc takes effect.
thread_sync.c (Init_thread_sync): teach rdoc Mutex.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread_sync.c: fix rdoc
thread_sync.c (define_thread_class): hide rb_define_class_under
from rdoc, so that fake code to teach rdoc takes effect.
thread_sync.c (Init_thread_sync): teach rdoc Mutex.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e