[DOC] time.c document updated.

* fraction -> subsecond
  for consistency with method name

* The sentence,
  "A non-portable feature allows the offset to be negative on some systems.",
  is removed.
  Time before 1970 should work portably now.
  If localtime() doesn't work before 1970,
  Ruby should extrapolate it.

* Time::new -> Time.new
  "::" for method call is not common notation now.

* Time#to_i truncates subsecond

* Time#to_f approximates a value in Time object

* Time#to_r
  The sentence,
  "You can use this method to convert _time_ to another Epoch.",
  is removed.
  It is not clear because no actual example of "another Epoch" is given.

* Time#usec truncates fraction of microseconds.

* Time#nsec truncates fraction of nanoseconds.

* describe Time#inspect shows subsecond since Ruby 2.7.0.

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