Fix remark on utmp byte order

[panhania]

I have verified on a s390x (so, big-endian) Ubuntu 20.04 distribution (using Docker) that the byte order of utmp files is big-endian (at least of entries in /var/log/wtmp and /var/run/utmp). Thus, I think it is reasonable to conclude that these use native endianness.

I have samples of these files if needed for test_data but I am unable to figure out how tests in these repository work to write one myself.

[joachimmetz]

Thanks for confirming, will have a closer look when time permits

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.38%. Comparing base (d14fb6b) to head (8422bd2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   52.38%   52.38%           
=======================================
  Files          41       41           
  Lines        7991     7991           
=======================================
  Hits         4186     4186           
  Misses       3805     3805           

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