[docs] [issue14318] clarify "may not" in time.steady docs

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

FYI "may not" comes from the C++ Timeout Specification:

"Objects of class steady_clock represent clocks for which values of time_point never decrease as physical time advances and for which values of time_point advance at a steady rate relative to real time. That is, the clock may not be adjusted."

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3191.htm

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