[docs] [issue17494] References to stack bottom are confusing

[Ezio Melotti]

Ezio Melotti added the comment:

Using "first" makes some sense, since it's talking about "previous", but I agree it might be confused with the top frame too.  What about this wording then:
-f_back is to the previous stack frame (towards the caller),
-or None if this is the bottom stack frame;
+f_back is to the previous stack frame (towards the caller),
+or None if this is the first frame at the bottom of the stack;

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nosy: +ezio.melotti
status: pending -> open

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17494>
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