Improve documentation of functions that accept time values
* doc/lispref/os.texi (Time Calculations): Mention the meaning of 'nil' or a scalar number as the time-value argument. Add a cross-reference to 'float-time' for computing a time difference as a scalar number of seconds. * src/editfns.c (Fformat_time_string, Ftime_less_p) (Ftime_subtract, Ftime_add, Fdecode_time, Fcurrent_time_string) (Fcurrent_time_zone): Mention in the doc strings the meaning of nil argument and the fact that a time value can be a scalar number of seconds since the epoch. (Ftime_subtract): Mention 'float-time'.
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