Format/typo check 1988/dale

This includes the thanks-for-fixes.md file where C code was actually in
the form of a diff (which happened when I was looking for the
differences to put in the file in the first place, forgetting to remove
the [-+] at the time).

1988/dale/README.md

@@ -1,6 +1,6 @@
 # Best abuse of system calls
 
-Paul Dale  
+Paul Dale<br>
 Australia  
 
 ## To build:
@@ -40,7 +40,8 @@ If you have an old enough compiler you can try the original version in
 make clobber alt
 ```
 
-Use `dale.alt` as you would `dale` above.
+Use `dale.alt` as you would `dale` above. To understand the differences in more
+detail, see [thanks-for-fixes.md](/thanks-for-fixes.md).
 
 
 ## Judges' remarks