Remove stray @endcode.

asio/include/asio/read_until.hpp

diff --git a/asio/include/asio/read_until.hpp b/asio/include/asio/read_until.hpp
index 083acac..7cf651f 100644
--- a/asio/include/asio/read_until.hpp
+++ b/asio/include/asio/read_until.hpp
@@ -1051,7 +1051,7 @@
  *   if (!e)
  *   {
  *     std::string line = data.substr(0, n);
- *     data.erase(0, n); @endcode
+ *     data.erase(0, n);
  *     ...
  *   }
  * }