[ty] Fix lint summary wording (astral-sh#19091)

Author: sharkdp

crates/ty_python_semantic/src/types/diagnostic.rs

@@ -307,7 +307,7 @@ declare_lint! {
     ///     d: bytes
     /// ```
     pub(crate) static DUPLICATE_KW_ONLY = {
-        summary: "detects dataclass definitions with more than once usages of `KW_ONLY`",
+        summary: "detects dataclass definitions with more than one usage of `KW_ONLY`",
         status: LintStatus::preview("1.0.0"),
         default_level: Level::Error,
     }