update year level README files

Move copyright notice to the end.

Add a standard comment about the newly added `README.md` files.

Clean up trailing whitespace.

Fixed a few minor typos.

1993/README

@@ -1,19 +1,14 @@
 1993 marked the "The Tenth International Obfuscated C Code Contest"
 
-Copyright (c) 1993, Landon Curt Noll & Larry Bassel.
-All Rights Reserved.  Permission for personal, educational or non-profit use is
-granted provided this this copyright and notice are included in its entirety
-and remains unaltered.  All other uses must receive prior permission in writing
-from both Landon Curt Noll and Larry Bassel.
+
+Look at the README.md file for the given winner for information
+on how to compile the winner and how to run the winning program.
+Look at the winning source and try to figure how it does what it does!
+You may then wish to look at the Author's comments for even more details.
 
 Use make to compile entries.  It is possible that on BSD or non-unix
 systems the makefile needs to be changed.  See the Makefile for details.
 
-Look at the source and try to figure out what the programs do, and run
-them with various inputs.  If you want to, look at the hints files for
-spoilers - this year we included most of the information included
-by the submitters.
-
 Read over the makefile for compile/build issues.  Your system may
 require certain changes (add or remove a library, add or remove a
 #define).
@@ -29,7 +24,7 @@ not be able to compile the winners, sorry!
 
 A few notes regarding future contests:
 
-Be sure to wait until the 1994 rules are posted before submitting entries.  
+Be sure to wait until the 1994 rules are posted before submitting entries.
 Rules differ from year to year, sometimes in significant ways.
 
 In 1994, we will retract the guideline that discouraged the use of C
@@ -54,6 +49,14 @@ email the fix (patch file or the entire changed file) to the above address.
 
 Credits:
 
-We would like to thank Barbara Frezza for her role as official chef 
+We would like to thank Barbara Frezza for her role as official chef
 of the contest.  Landon Noll and Larry Bassel appreciated the opportunity
 to serve as official taste testers.  And as usual, the food was excellent.
+
+=-=
+
+Copyright (c) 1993, Landon Curt Noll & Larry Bassel.
+All Rights Reserved.  Permission for personal, educational or non-profit use is
+granted provided this this copyright and notice are included in its entirety
+and remains unaltered.  All other uses must receive prior permission in writing
+from both Landon Curt Noll and Larry Bassel.