Format/typo check 1988/applin

The README.md and the Makefile were both updated. The Makefile because
of typos/unclear things. The README.md had formatting fixes and also
added the historical note about 1988 from the Makefile as it's far less
likely people will see that note versus that which is in the README.md.

1988/applin/Makefile

@@ -131,9 +131,9 @@ all: data ${TARGET}
 #
 # This entry took 75 minutes to compile on a Amdahl 5980-300E
 # (a 55658 Dhyrstone/sec/cpu machine) using the System V cpp.
-# (The GNU cpp when defined as BIG_CPP took only 45 seconds)
+# (The GNU cpp when defined as BIG_CPP took only 45 seconds.)
 # Your cpp may not be able to compile it due to a common bug
-# that results in ${CPP} running out of space.  The routine
+# that results in cpp running out of space.  The routine
 # 'zsmall' is a smaller version of the applin.c entry.
 #
 ${PROG}: ${PROG}.c