[docs] [issue28590] fstring's '{' from escape sequences does not start an expression

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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assignee:  -> docs at python
components: +Documentation -Interpreter Core
nosy: +docs at python

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28590>
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