Fixes in 1995 winning entries' README.md files

...minus the ones that were fixed in earlier commits for specific
reasons.

Besides formatting and typo fixes I think the only thing noteworthy is
that 1995/spinellis was missing the URL which has been added now.

1995/makarios/README.md

@@ -1,25 +1,29 @@
 # Best Short Program
 
-    Selene Makarios & Heather Downs
-    The Software Bungalow
-    900 High School Way, #2202
-    Mountain View, CA 94041
-    USA
+Selene Makarios & Heather Downs  
+The Software Bungalow  
+900 High School Way, #2202  
+Mountain View, CA 94041  
+USA  
 
 ## To build:
 
-        make all
+```sh
+make all
+```
 
 ## To run:
 
-	./makarios
+```sh
+./makarios
+```
 
-## Judges' remarks
+## Judges' remarks:
 
 The judges were impressed that such a small program could do so much!
 Can you figure out how it does it?
 
-## Author's remarks
+## Author's remarks:
 
 This program takes no arguments. It emits the base 8 representation
 of prime palindromes (palindromic in base 8, of course).