Format / typo check YYYY/README.md files

It should be pointed out that there are a few inconsistencies as noted
below.

In some years the title of entries that were explicitly listed were
linked to but as the README.md files no longer have the title it was not
as easy to locate the title (I could go back in archive/historic and I
did in some cases but I was trying to hurry this up to close #3).

It's most likely that some have backticks surrounding certain words like
gcc or something else but not in all files. An example that might be
there is '#define'.

Some wording is different. Usually this is due to the original wording
which I did not think was good to change. There might be other cases
that were missed as well. One thing is that comes to mind is that in
some README.md files it refers to the Makefile to check for build
instructions, in others it refers to the index.html file and in some it
refers to both. But the index.html has how to build so they should
probably all say index.html and not refer to the Makefile. This was also
done in a rush.

There might be other inconsistencies or things that might want to be
fixed but whether it's worth it given is unclear at this time. It can be
argued that the reference to the Makefiles for build instructions is a
historical comment to keep there as an example of why not to change it.

There were other things I noticed that I could not address or did not
feel were necessary but with this commit an important task is can likely
be considered done unless it is decided that some of these should be
fixed or if looking at the rendered output there is a problem.

1989/README.md

@@ -11,15 +11,14 @@ System V or non-Unix systems the Makefile needs to be changed).
 This year, the Grand Prize was given to the most useful program.
 
 The ["Strangest abuse of the rules"](jar.1/indx.html) award was given this year
-to stress the fact that starting in 1990, compiling entries must result an
-executable regular file.
+to stress the fact that starting in 1990, compiling entries must result a
+regular executable file.
 
 The Makefile always uses the portable version of the ["Best
 self modifying program"](fubar/indx.html) because there is no loss of functionality in
 using it.  In the case of the ["Best game"](tromp/README) entry, however, some
 functionality is lost in the portable version and so the Makefile uses
-the original program. System V users may need to change the Makefile
-to use the s5 version. See the hint files or the Makefile for details.
+the original program.
 
 [Rules](rules.txt) and results were posted to comp.lang.c, comp.sources.unix, and
 alt.sources.  They have been made available on a wide number of USENET