en/handbook/users: proposed corrections

[Taras Korenko]

  Updated version of the second patch follows.

P.S.: the funniest thing is that contents of users chapter was integrated
      into basics chapter in r42953, users chapter was removed (again r42953),
      and reappeared after db5 merge, updated with new subchapter (<sect1
      xml:id="users-becomesuper"/>) still being excluded from the build.
      So, next, I am to adapt current two patches to the new location:
      basics chapter :-/

-- 
  WBR, Taras Korenko
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