address review: enabled -> true

Author: skirpichev

Doc/library/math.rst

@@ -874,7 +874,7 @@ Constants
 
    The :mod:`math` module consists mostly of thin wrappers around the platform C
    math library functions.  Behavior in exceptional cases follows Annex F of
-   the C99 standard, if :attr:`sys.float_info.stdc_iec_559` is enabled.  The current implementation will raise
+   the C99 standard, if :attr:`sys.float_info.stdc_iec_559` is true.  The current implementation will raise
    :exc:`ValueError` for invalid operations like ``sqrt(-1.0)`` or ``log(0.0)``
    (where C99 Annex F recommends signaling invalid operation or divide-by-zero),
    and :exc:`OverflowError` for results that overflow (for example,

Doc/library/sys.rst

@@ -774,7 +774,7 @@ always available. Unless explicitly noted otherwise, all variables are read-only
       * - .. attribute:: float_info.stdc_iec_559
         - :c:macro:`!__STDC_IEC_559__`
         - A boolean, indicating support the IEC 60559 floating-point
-          standard (the Annex F of C99).  If enabled, the
+          standard (the Annex F of C99).  If true, the
           :class:`float` type characteristics matches the IEC
           60559 double format and exceptional cases for
           the :mod:`math` functions follow to the section F.10