[docs] [issue12207] Document ast.PyCF_ONLY_AST

[Mark Lawrence]

Mark Lawrence added the comment:

PyCF_ONLY_AST is defined in pythonrun.h and referenced in bltinmodule.c, Python-ast.c and pythonrun.c.  Should it be documented or not?

----------
nosy: +BreamoreBoy

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12207>
_______________________________________