docs: add chmem and tailf to ReleaseNotes

Signed-off-by: Karel Zak <kzak@redhat.com>

Documentation/releases/v2.30-ReleaseNotes

@@ -7,6 +7,8 @@ makes UDF media on Linux user-space more compatible with another operation
 systems. Unfortunately, this change may introduce regression for (unusual)
 hybrid CDROM/DVDs where ISO and UDF use a different LABEL=.
 
+The deprecated command tailf has been removed. Use "tail -f" from coreutils.
+
 
 blkzone -- NEW COMMAND to run zone commands on block device that support Zoned
 Block Commands (ZBC) or Zoned-device ATA Commands (ZAC). The currently
@@ -20,6 +22,9 @@ lsmem -- NEW COMMAND to list the ranges of available memory with their online
 status (originally implementd in Perl for s390-tools). [thanks to Clemens von Mann 
 and Heiko Carstens (IBM)]
 
+chmem -- NEW COMMAND to set memeory online/offline status [thanks to Heiko
+Carstens (IBM)]
+
 
 The old and dead Alpha and Cmos code has been removed from hwclock command.