Fixed documentation warnings (#1381)

boa/src/builtins/array/mod.rs

@@ -278,7 +278,7 @@ impl Array {
 
     /// `get Array [ @@species ]`
     ///
-    /// The Array[@@species] accessor property returns the Array constructor.
+    /// The `Array [ @@species ]` accessor property returns the Array constructor.
     ///
     /// More information:
     ///  - [ECMAScript reference][spec]

boa/src/builtins/map/mod.rs

@@ -174,7 +174,7 @@ impl Map {
 
     /// `get Map [ @@species ]`
     ///
-    /// The Map[@@species] accessor property returns the Map constructor.
+    /// The `Map [ @@species ]` accessor property returns the Map constructor.
     ///
     /// More information:
     ///  - [ECMAScript reference][spec]

boa/src/builtins/regexp/mod.rs

@@ -270,9 +270,9 @@ impl RegExp {
         Ok(this)
     }
 
-    /// `get RegExp[@@species]`
+    /// `get RegExp [ @@species ]`
     ///
-    /// The RegExp[@@species] accessor property returns the RegExp constructor.
+    /// The `RegExp [ @@species ]` accessor property returns the RegExp constructor.
     ///
     /// More information:
     ///  - [ECMAScript reference][spec]