Format fix 1980s and 1990s README.md files

I also updated the todo.md file as I left some things out that have to
be done. I only explicitly named one thing but when I go over them as a
final pass I will address the things in question (some will require
discussion).

1987/README.md

@@ -1,25 +1,25 @@
-1987 marked the "The Fourth International Obfuscated C Code Contest"
+# 1987 marked the "The Fourth International Obfuscated C Code Contest"
 
-
-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 remarks for even more details.
+Look at the README.md file for the given winning entry for information on how to
+compile it 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 remarks for even more details.
 
 The [rules for 1997](rules.txt) suggested even more categories than in 1986.
 Hints for what to do and not to do were also given in the [rules](rules.txt).
-For example, a simple excessive abuse of /lib/cpp was discouraged unless the
+For example, a simple excessive abuse of `/lib/cpp` was discouraged unless the
 abuse was unusual.  The mailboxes for the contest were moved from nsc to amdahl.
 The practice of posting a preliminary set of rules for the next year was started
 this year.
 
-[Rules](rules.txt) and results were posted to comp.lang.c and comp.unix.wizards with
-an announcement in news.announce.important.  Micro/Systems Journal
+[Rules](rules.txt) and results were posted to comp.lang.c and comp.unix.wizards
+with an announcement in news.announce.important.  Micro/Systems Journal
 published the 1987 winners.  [Mark R.
-Horton](https://www.amazon.com/stores/Mark-R.-Horton/author/B001HPGRB8) included a version of the [1987
-winners](../years.html#1987) in an appendix of his C book [Portable C Software International
+Horton](https://www.amazon.com/stores/Mark-R.-Horton/author/B001HPGRB8) included
+a version of the [1987 winners](../years.html#1987) in an appendix of his C book
+[Portable C Software International
 Edition](https://www.amazon.com/Portable-Software-Mark-R-Horton/dp/0138680507).
-The first announcement of winners at the Summer 87 Usenix was helped by a small
+The first announcement of winners at the Summer 87 USENIX was helped by a small
 fly that danced all over the foils.
 
 =-=