[docs] [issue29928] Add f-strings to Glossary

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

"f-string" is widely used, but misleading term. It is not used in the documentation. But "formatted string literal" is not better. This isn't literal, this isn't special kind of strings, this is a special formatting expression resulting to string.

There was a discussion on Python-Dev about better term, but it didn't come to any conclusion.

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nosy: +serhiy.storchaka

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