C++: Fix QLDoc copy-paste fails.

Author: MathiasVP

cpp/ql/lib/semmle/code/cpp/models/implementations/StdException.qll

@@ -1,5 +1,5 @@
 /**
- * Provides models for the C++ `std::pair` class.
+ * Provides models for the C++ `std::exception` class and subclasses.
  */
 
 import semmle.code.cpp.models.interfaces.Taint

cpp/ql/lib/semmle/code/cpp/models/implementations/StdFunction.qll

@@ -1,5 +1,5 @@
 /**
- * Provides models for C++ containers `std::array`, `std::vector`, `std::deque`, `std::list` and `std::forward_list`.
+ * Provides models for C++ `std::function` class.
  */
 
 import semmle.code.cpp.models.interfaces.SideEffect