Add leading example sentence in C3201 and C3203 error reference

Author: Rageking8

docs/error-messages/compiler-errors-2/compiler-error-c3201.md

@@ -15,6 +15,8 @@ You passed a class template in the argument to a class template that does not ta
 
 ## Example
 
+The following example generates C3201:
+
 ```cpp
 // C3201.cpp
 template<typename T1, typename T2>

docs/error-messages/compiler-errors-2/compiler-error-c3203.md

@@ -17,6 +17,8 @@ This error can be generated as a result of compiler conformance work that was do
 
 ## Examples
 
+The following example generates C3203:
+
 ```cpp
 // C3203.cpp
 template< typename T >