Revise no_implicit_prelude.allowed-positions text

It's more clear to say either that something can be applied "at the
crate level" or "to the crate" than "to the crate level".  Let's pick
the latter and adjust for better grammatical parallelism.

Author: traviscross

src/names/preludes.md

@@ -176,7 +176,7 @@ r[names.preludes.no_implicit_prelude.syntax]
 The `no_implicit_prelude` attribute uses the [MetaWord] syntax.
 
 r[names.preludes.no_implicit_prelude.allowed-positions]
-The `no_implicit_prelude` attribute may only be applied to the crate level or a module.
+The `no_implicit_prelude` attribute may only be applied to the crate or to a module.
 
 > [!NOTE]
 > `rustc` ignores use in other positions but lints against it. This may become an error in the future.