Dox fix: we always remove "u"

docs/the_black_code_style/current_style.md

@@ -234,11 +234,9 @@ will replace the latter with the former as long as it does not result in more ba
 escapes than before.
 
 _Black_ also standardizes string prefixes. Prefix characters are made lowercase with the
-exception of [capital "R" prefixes](#rstrings-and-rstrings), and in the case of multiple
-characters "r" is put first as in spoken language: "raw f-string". On top of that, if
-your code is already Python 3.6+ only or it's using the `unicode_literals` future
-import, _Black_ will remove `u` from the string prefix as it is meaningless in those
-scenarios.
+exception of [capital "R" prefixes](#rstrings-and-rstrings), unicode literal markers
+(`u`) are removed because they are meaningless in Python 3, and in the case of multiple
+characters "r" is put first as in spoken language: "raw f-string".
 
 The main reason to standardize on a single form of quotes is aesthetics. Having one kind
 of quotes everywhere reduces reader distraction. It will also enable a future version of