Fix no_implicit_prelude to document the *current* edition in the main text

This follows our style guide where the main text should document the
current edition, and the edition blocks should note the differences to
previous editions.

Author: ehuss

src/names/preludes.md

@@ -174,7 +174,7 @@ Duplicate instances of the `no_implicit_prelude` attribute have no effect.
 > `rustc` currently warns on subsequent duplicate `no_implicit_prelude` attributes.
 
 r[names.preludes.no_implicit_prelude.excluded-preludes]
-The `no_implicit_prelude` attribute prevents the [standard library prelude], [extern prelude], and the [tool prelude] from being brought into scope for the module or any of its descendants.
+The `no_implicit_prelude` attribute prevents the [standard library prelude], [extern prelude], [`macro_use` prelude], and the [tool prelude] from being brought into scope for the module or any of its descendants.
 
 r[names.preludes.no_implicit_prelude.lang]
 The `no_implicit_prelude` attribute does not affect the [language prelude].