fix improper use of whitespace in README.md files

The use of the markdown trailing whitespace to indicate
line break should NOT be done when the following line is empty.

This removes such improper use of whitespace in README.md files.

1987/korn/README.md

@@ -1,7 +1,7 @@
 # Best One Liner
 
 David Korn   
-US   
+US
 
 ## To build:
 
@@ -33,7 +33,7 @@ Several points are important to understand this program:
 characters, or `'h'`, or a string)  Consider the fact that:
 
 
-	    char *x;  
+	    char *x;
 
 
   defines a pointer to a `char` (i.e. an address), and that the `=` assigns
@@ -46,11 +46,11 @@ characters, or `'h'`, or a string)  Consider the fact that:
 3. Note that the following expressions yield the same value:
 
 
-        x[3]	*(x+3)	  *(3+x)  
+        x[3]	*(x+3)	  *(3+x)
 
-   since addition is commutative.  What can be said about the value:  
+   since addition is commutative.  What can be said about the value:
 
-        3[x]  
+        3[x]
 
     ?