doc: remove already implemented items from TODO

* TODO (renice): The renice program is part of util-linux for
years now. Remove entry.
(dd): The option status=none has been implemented in commit
v8.19-143-g7331ab5. Remove entry.

TODO

@@ -37,10 +37,6 @@ printf:
 consider adding some implementation of the "col" utility
   Suggested by Karl Berry.
 
-renice: POSIX utility, needs implementing.
-  suggestion from Karl Berry (among others).
-  Bob Proulx is working on this.
-
 doc/coreutils.texi:
   Address this comment: FIXME: mv's behavior in this case is system-dependent
   Better still: fix the code so it's *not* system-dependent.
@@ -119,10 +115,6 @@ Changes expected to go in, someday.
   an implicit --NO-dereference-command-line-symlink-to-dir meaning.
   Pointed out by Karl Berry.
 
-  dd: consider adding an option to suppress 'bytes/block read/written'
-  output to stderr.  Suggested here:
-    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=165045
-
   Pending copyright papers:
   ------------------------
   getpwnam from Bruce Korb