chore(utils): keep the offset comparison comment to its rationale

CLAUDE.md keeps change history in commit messages, so the comment only states
why the offsets are compared instead of recounting the previous behaviour.

Signed-off-by: laoyyu <laoyyu@foxmail.com>

Author: laoyyu

packages/utils/src/formatting.ts

@@ -57,9 +57,7 @@ export function getTimezoneAbbreviation(timezone: string, date: Date = new Date(
 
   const zone = timezoneMap[timezone]
   if (zone) {
-    // Compare the zone's UTC offsets across the year: `format()` always
-    // includes the calendar date, so comparing formatted strings reported
-    // "DST observed" for the whole year and then "daylight" for every date.
+    // Compare UTC offsets because `format()` also includes the calendar date.
     const januaryOffset = getOffsetMinutes(timezone, new Date(date.getFullYear(), 0, 1))
     const julyOffset = getOffsetMinutes(timezone, new Date(date.getFullYear(), 6, 1))