Add leading example sentence in C4550 warning reference

Author: Rageking8

docs/error-messages/compiler-warnings/compiler-warning-level-1-c4550.md

@@ -15,6 +15,8 @@ A dereferenced pointer to a function is missing an argument list.
 
 ## Example
 
+The following example generates C4550:
+
 ```cpp
 // C4550.cpp
 // compile with: /W1