Revert "Fix rustdoc warnings (#526)" (#528)

This reverts commit 58ca728c5f.

The commit passed CI but it's causing `cargo test` to fail locally for
me. This is with rustc 1.47.0.

src/bigint.rs

@@ -57,9 +57,7 @@ impl BigInt {
   /// specified list of digits/words.
   /// The resulting number is calculated as:
   ///
-  /// ```
   /// (-1)^sign_bit * (words[0] * (2^64)^0 + words[1] * (2^64)^1 + ...)
-  /// ```
   pub fn new_from_words<'s>(
     scope: &mut HandleScope<'s>,
     sign_bit: bool,

src/data.rs

@@ -503,7 +503,7 @@ impl_partial_eq! { ObjectTemplate for Template use identity }
 /// and "instance" for the instance object created above. The function
 /// and the instance will have the following properties:
 ///
-/// ```javascript,ignore
+/// ```ignore
 ///   func_property in function == true;
 ///   function.func_property == 1;
 ///
@@ -547,7 +547,7 @@ impl_partial_eq! { ObjectTemplate for Template use identity }
 /// The Child function and Child instance will have the following
 /// properties:
 ///
-/// ```javascript,ignore
+/// ```ignore
 ///   child_func.prototype.__proto__ == function.prototype;
 ///   child_instance.instance_accessor calls 'InstanceAccessorCallback'
 ///   child_instance.instance_property == 3;

src/promise.rs

@@ -77,7 +77,7 @@ impl Promise {
     unsafe { v8__Promise__HasHandler(&*self) }
   }
 
-  /// Returns the content of the Promise Result. The Promise must not
+  /// Returns the content of the [[PromiseResult]] field. The Promise must not
   /// be pending.
   pub fn result<'s>(&self, scope: &mut HandleScope<'s>) -> Local<'s, Value> {
     unsafe { scope.cast_local(|_| v8__Promise__Result(&*self)) }.unwrap()