* Add test case for cfg(false) on module level

* Fix typo
* Remove usage of `!has`

Author: GuillaumeGomez

tests/rustdoc/cfg-bool.rs

@@ -3,11 +3,14 @@
 
 // regression test for https://github.com/rust-lang/rust/issues/138112
 
+//@ has 'foo/index.html'
+//@ has - '//*[@class="stab portability"]/@title' 'Available nowhere'
+
 //@ has 'foo/fn.foo.html' '//div[@class="stab portability"]' 'Available nowhere'
 #[doc(cfg(false))]
 pub fn foo() {}
 
-// a cfg(true) will simply be ommited, as it is the same as no cfg.
+// a cfg(true) will simply be omited, as it is the same as no cfg.
 //@ !has 'foo/fn.bar.html' '//div[@class="stab portability"]' ''
 #[doc(cfg(true))]
 pub fn bar() {}