fix wording for derivable_impls

Author: kraktus

clippy_lints/src/derivable_impls.rs

@@ -40,7 +40,7 @@ declare_clippy_lint! {
     ///
     /// ### Known problems
     /// Derive macros [sometimes use incorrect bounds](https://github.com/rust-lang/rust/issues/26925)
-    /// in generic types and the user defined `impl` maybe is more generalized or
+    /// in generic types and the user defined `impl` may be more generalized or
     /// specialized than what derive will produce. This lint can't detect the manual `impl`
     /// has exactly equal bounds, and therefore this lint is disabled for types with
     /// generic parameters.

src/docs/derivable_impls.txt

@@ -29,7 +29,7 @@ struct Foo {
 
 ### Known problems
 Derive macros [sometimes use incorrect bounds](https://github.com/rust-lang/rust/issues/26925)
-in generic types and the user defined `impl` maybe is more generalized or
+in generic types and the user defined `impl` may be more generalized or
 specialized than what derive will produce. This lint can't detect the manual `impl`
 has exactly equal bounds, and therefore this lint is disabled for types with
 generic parameters.