Update outdated sentences in trans.py

src/black/trans.py

@@ -794,7 +794,7 @@ def _validate_msg(line: Line, string_idx: int) -> TResult[None]:
                 - The set of all string prefixes in the string group is of
                   length greater than one and is not equal to {"", "f"}.
                 - The string group consists of raw strings.
-                - The string group would merge f-strings with different quote types.
+                - The string group merge would change f-string quote style.
                 - The string group is stringified type annotations. We don't want to
                   process stringified type annotations since pyright doesn't support
                   them spanning multiple string values. (NOTE: mypy, pytype, pyre do
@@ -847,7 +847,7 @@ def _validate_msg(line: Line, string_idx: int) -> TResult[None]:
 
             if "f" in prefix and leaf.value[-1] != QUOTE:
                 return TErr(
-                    "StringMerger does NOT merge f-strings with different quote types."
+                    "StringMerger does NOT change f-string quote style on merge."
                 )
 
             if id(leaf) in line.comments: