[issue31907] doc: Clarify error message when attempting to call function via str.format()

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:


New changeset fb1d01b9630b5069fe975f16e07a027d90b89434 by Irit Katriel in branch 'master':
bpo-31907: [doc] clarify that str.format() does not support arbitrary expressions (#25053)
https://github.com/python/cpython/commit/fb1d01b9630b5069fe975f16e07a027d90b89434


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