misc/xdelta: Wrap README at 72 columns.

Signed-off-by: B. Watson <yalhcru@gmail.com>

misc/xdelta/README

@@ -1,9 +1,10 @@
 xdelta - Binary delta generator
 
-Xdelta is a program designed to compute changes between files.  These changes 
-(deltas) are similar to the output of the "diff" program in that they may be 
-used to store and transmit only the changes between files.  However, unlike 
-diff(1), the output of xdelta is not expressed in a human-readable format.
+Xdelta is a program designed to compute changes between files. These
+changes (deltas) are similar to the output of the "diff" program in
+that they may be used to store and transmit only the changes between
+files. However, unlike diff(1), the output of xdelta is not expressed
+in a human-readable format.
 
-Xdelta uses a fast, linear algorithm and performs well on both binary and 
-text files.
+Xdelta uses a fast, linear algorithm and performs well on both binary
+and text files.