Remove outdated example in C2998 error reference

Author: Rageking8

docs/error-messages/compiler-errors-2/compiler-error-c2998.md

@@ -11,11 +11,3 @@ ms.assetid: 8193d491-b5d9-4477-acb1-cf166889c070
 > '*identifier*': cannot be a template definition
 
 The compiler could not process the syntax used in the template definition.
-
-The following sample generates C2998:
-
-```cpp
-// C2998.cpp
-// compile with: /c
-template <class T> int x = 1018; // C2998
-```