Normalize spelling

Note that "UNIX" is a trademark, "Unix" is not

Author: garydgregory

commons-vfs2/src/main/java/org/apache/commons/vfs2/util/Os.java

@@ -66,7 +66,7 @@ public final class Os {
     public static final OsFamily OS_FAMILY_NETWARE = new OsFamily("netware");
 
     /**
-     * All UNIX based OSes.
+     * All Unix based OSes.
      */
     public static final OsFamily OS_FAMILY_UNIX = new OsFamily("unix");
 

commons-vfs2/src/main/java/org/apache/commons/vfs2/util/PosixPermissions.java

@@ -21,7 +21,7 @@
 import java.util.Map;
 
 /**
- * UNIX permissions.
+ * Unix permissions.
  *
  * @since 2.1
  */