fix typos

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38951 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/objspace/objspace.c

@@ -730,8 +730,8 @@ collect_values(st_data_t key, st_data_t value, st_data_t data)
  *  you can check the type of internal object with `type' method.
  *
  *  If `obj' is instance of `ObjectSpace::InternalObjectWrapper'
- *  class, then this method retuns all reachalbe object from
- *  an interna object, which is pointed by `obj'.
+ *  class, then this method returns all reachable object from
+ *  an internal object, which is pointed by `obj'.
  *
  *  With this method, you can find memory leaks.
  *