build: upd docs

Author: horockey

godoc-current.txt

@@ -941,7 +941,10 @@ type TimestampArg = ArgumentBase[time.Time, TimestampConfig, timestampValue]
 
 type TimestampConfig struct {
 	Timezone *time.Location
-	Layouts  []string
+	// Available layouts for flag value.
+	//
+	// Note that value for formats with missing year/date will be interpreted as current year/date respectively.
+	Layouts []string
 }
     TimestampConfig defines the config for timestamp flags