docs: remove hwclock --compare from TODO

commit 83765871ef added the --compare
option to hwclock so it can be removed from the TODO.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>

Documentation/TODO

@@ -23,27 +23,6 @@ dmesg
 
  - add --color to colorize err and panic messages
 
-hwclock
--------
-
- - (!!!) add "hwclock -c|--compare" to provide info about RTC frequency offset
-   like "adjtimex -c", shell version:
-
-	#!/bin/bash
-	date > /dev/null
-	hwdate=$(hwclock -r)
-	time1_sys=$(date +'%s.%N')
-	time1_hw=$(date -d "${hwdate% -*}" +'%s')
-
-	while sleep 10; do
-	    hwdate=$(hwclock -r)
-	    time2_sys=$(date +'%s.%N')
-	    time2_hw=$(date -d "${hwdate% -*}" +'%s')
-	    awk "END { x = (($time1_hw - $time1_sys) - ($time2_hw - $time2_sys)) /
-	($time2_hw - $time1_hw); printf \"sysclock/RTC frequency offset: %.0f ppm (%.0f
-	ticks)\n\", x * 1e6, x * 1e4}" < /dev/null
-	done
-
 minix (fsck, mkfs)
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