corrected target name

assignments/pduLog/README.md

@@ -14,4 +14,4 @@ the corresponding homework or project directory (and likely renaming as well).
 Note that the PDU log files are very tolerant of inline comments starting with
 a # character, so you can document success/failure and TODO issues there as well.
 
-To clean out old log files, simply run this directory's **[build.xml](build.xml)** target `clean.all.log.files`
+To clean out old log files, simply run this directory's **[build.xml](build.xml)** target `clean.all.pduLogs`