Update compiler/rustc_error_codes/src/error_codes/E0582.md

Co-authored-by: Felix S Klock II <pnkfelix@pnkfx.org>

compiler/rustc_error_codes/src/error_codes/E0582.md

@@ -42,7 +42,7 @@ where
     f: F
 }
 ```
-This is as `Foo::Assoc<'a>` could be implemented by a type that does not use
+The latter scenario encounters this error because `Foo::Assoc<'a>` could be implemented by a type that does not use
 the `'a` parameter, so there is no guarentee that `X::Assoc<'a>` actually uses
 `'a`.