C#: Address review comments.

Author: michaelnebel

csharp/ql/src/change-notes/2025-04-10-uncontrolled-format-string.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* The precision of the query `cs/uncontrolled-format-string` has been improved. Calls to `System.Text.CompositeFormat.Parse` are now considered a format like method call.
+* The precision of the query `cs/uncontrolled-format-string` has been improved (false negative reduction). Calls to `System.Text.CompositeFormat.Parse` are now considered a format like method call.