Format/typo check 1996/dalbec

Also since it was my proposed fix to the code (for clang) I decided to
change the function name to how I've been doing it: rather than 'cain()'
it is now 'pain()'.

1996/dalbec/README.md

@@ -66,9 +66,7 @@ where `a==0`.
 4. The fact that `main()` is a single expression and so beautifies poorly.
 
 5. The fact that `main()` is used:
-
     - to compute powers in modular arithmetic.
-
     - to recursively call itself in the main loop.