Fix Bikeshed errors in scanning.bs (#487)

* Replace [Constructor] attribute with new constructor syntax

* Remove linking for the term "present"

scanning.bs

@@ -220,7 +220,7 @@ spec:web-bluetooth
       a {{BluetoothLEScanFilter}} in an active {{BluetoothLEScan}}
       cause {{advertisementreceived}} events to be dispatched
       to the sending {{BluetoothDevice}}.
-      A filter matches if the advertisement includes data equal to each <a>present</a> member.
+      A filter matches if the advertisement includes data equal to each present member.
       Usually, you'll only include one member in each filter.
     </p>
     <p>
@@ -344,24 +344,24 @@ spec:web-bluetooth
     <h3 id="scan-control">Controlling a BLE scan</h3>
 
     <pre class="idl">
-      [Constructor(optional BluetoothDataFilterInit init)]
       interface BluetoothDataFilter {
+        constructor(optional BluetoothDataFilterInit init);
         readonly attribute ArrayBuffer dataPrefix;
         readonly attribute ArrayBuffer mask;
       };
 
-      [Constructor(optional object init)]
       interface BluetoothManufacturerDataFilter {
+        constructor(optional object init);
         readonly maplike&lt;unsigned short, BluetoothDataFilter>;
       };
 
-      [Constructor(optional object init)]
       interface BluetoothServiceDataFilter {
+        constructor(optional object init);
         readonly maplike&lt;UUID, BluetoothDataFilter>;
       };
 
-      [Constructor(optional BluetoothLEScanFilterInit init)]
       interface BluetoothLEScanFilter {
+        constructor(optional BluetoothLEScanFilterInit init);
         readonly attribute DOMString? name;
         readonly attribute DOMString? namePrefix;
         readonly attribute FrozenArray&lt;UUID>? services;
@@ -417,7 +417,7 @@ spec:web-bluetooth
           <code>{{BluetoothUUID/getService()|BluetoothUUID.getService}}(|init|.{{BluetoothLEScanFilterInit/services}}</code>.
         </li>
         <li>
-          For each other <a>present</a> member in |init|,
+          For each other present member in |init|,
           set `this`'s attribute with a matching identifier to the value of the member.
         </li>
         <li>