Add leading example sentence for warning references in range [C4081, C4120]

Author: Rageking8

docs/error-messages/compiler-warnings/compiler-warning-level-1-c4081.md

@@ -15,6 +15,8 @@ The compiler expected a different token in this context.
 
 ## Example
 
+The following example generates C4081:
+
 ```cpp
 // C4081.cpp
 // compile with: /W1 /LD

docs/error-messages/compiler-warnings/compiler-warning-level-1-c4083.md

@@ -15,6 +15,8 @@ An identifier occurs in the wrong place in a **#pragma** statement.
 
 ## Example
 
+The following example generates C4083:
+
 ```cpp
 // C4083.cpp
 // compile with: /W1 /LD

docs/error-messages/compiler-warnings/compiler-warning-level-1-c4086.md

@@ -15,6 +15,8 @@ The pragma parameter does not have the required value (1, 2, 4, 8, or 16).
 
 ## Example
 
+The following example generates C4086:
+
 ```cpp
 // C4086.cpp
 // compile with: /W1 /LD

docs/error-messages/compiler-warnings/compiler-warning-level-1-c4087.md

@@ -17,6 +17,8 @@ This warning is for the C compiler.
 
 ## Example
 
+The following example generates C4087:
+
 ```c
 // C4087.c
 // compile with: /W1

docs/error-messages/compiler-warnings/compiler-warning-level-1-c4109.md

@@ -15,6 +15,8 @@ The pragma containing the unexpected identifier is ignored.
 
 ## Example
 
+The following example generates C4109:
+
 ```cpp
 // C4109.cpp
 // compile with: /W1 /LD

docs/error-messages/compiler-warnings/compiler-warning-level-2-c4094.md

@@ -15,6 +15,8 @@ The compiler detected an empty declaration using an untagged structure, union, o
 
 ## Example
 
+The following example generates C4094:
+
 ```cpp
 // C4094.cpp
 // compile with: /W2