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PEP 3104: Add footnote to give example (#2027) 

While reading PEP 3104 to understand the ``nonlocal`` keyword, I found the explanation for why an alternative was not chosen to be vague. Further digging revealed an example for why there was a concern that ``.x`` and ``x`` could be used interchangeably. I linked this example as a footnote to save future readers time from digging to find an example. I hope this will increase comprehension of the PEP for future learners.
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@ -251,9 +251,10 @@ in an outer scope when using the variable in an expression. One
syntax that has been suggested for this is ``.x`` [7]_, which would
refer to ``x`` without creating a local binding for it. A concern
with this proposal is that in many contexts ``x`` and ``.x`` could
be used interchangeably, which would confuse the reader. A closely
related idea is to use multiple dots to specify the number of scope
levels to ascend [8]_, but most consider this too error-prone [17]_.
be used interchangeably, which would confuse the reader [31]_. A
closely related idea is to use multiple dots to specify the number
of scope levels to ascend [8]_, but most consider this too error-prone
[17]_.
Rebinding Operator
''''''''''''''''''
@ -528,6 +529,9 @@ References
.. [30] Whatever happened to 'nonlocal x = y'? (Guido van Rossum)
https://mail.python.org/pipermail/python-dev/2018-January/151627.html
.. [31] Using and binding relative names (Almann T. Goo)
https://mail.python.org/pipermail/python-dev/2006-February/061761.html
Acknowledgements