update tombstone

Author: jeffszuhay

Chapter04/printDistance2.c

@@ -1,6 +1,6 @@
 //  printDistance2.c
 //  Chapter 4: Using Variables and Assignment
-//  <book title>
+//  Learn C Programming
 // 
 //  A better function that demonstrates the use of 
 //  assignment via actual parameters and
@@ -11,6 +11,10 @@
 //  2) local variable yards is explicitly declared so its
 //     value and use are clear.
 //
+// Compile with:
+//
+//    cc printDistance2.c -Wall -Werror -std=c11
+//
 
 #include(<stdio.h>