Fix my stupid mistake (highlighting in CODINGSTYLE.md)

CODINGSTYLE.md

@@ -31,7 +31,7 @@ Variables should be prefixed with specific chars depending on where the variable
 - Global Variable - Prefix with `g`
 - Static Variable - Prefix with `s`
 Example:
-```c++
+```cpp
 const int gAmountOfTimesISuccessfullyWriteGoodVariableNames = 0;
 
 class ExampleClass final {