Update utempter designation to be 'etterminal' plus misspelling update.

[jshort]

The actual process that defines the wtmp session is etterminal, so let's make that very clear in the utempter record.

ex before:

❯ last | head
jwshort  pts/8        et [275430]      Fri Dec  5 10:20    gone - no logout

ex after:

❯ last -w | head
jwshort  pts/8        etterminal [4036829]     Fri Dec  5 10:03 - 10:20  (00:17)

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 73.45%. Comparing base (0842e15) to head (a145655). :warning: Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #717      +/-   ##
==========================================
- Coverage   73.67%   73.45%   -0.22%     
==========================================
  Files          51       51              
  Lines        3217     3217              
  Branches      400      400              
==========================================
- Hits         2370     2363       -7     
- Misses        847      854       +7     

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