[docs] [issue36858] f-string '=' debugging output needs to be documented

[Mariatta Wijaya]

Mariatta Wijaya <mariatta at python.org> added the comment:

Related issue where the '=' debug mode was implemented: https://bugs.python.org/issue36817

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nosy: +Mariatta
stage:  -> needs patch

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36858>
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