Clean up external specifications list

Removed duplicate external specifications for WebDriver BiDi modules.

Author: mohamedamir

index.bs

@@ -14995,23 +14995,6 @@ Note: the list is not exhaustive and might not be up to date.
 
 The following external specifications define additional WebDriver BiDi modules:
 
-1. <a href="https://www.w3.org/TR/permissions/#automation-webdriver-bidi">Permissions</a>
-
-1. <a href="https://wicg.github.io/nav-speculation/prefetch.html#automated-testing">nav-speculation</a>
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-1. <a href="https://wicg.github.io/ua-client-hints/#automation">User-Agent Client Hints</a>
-
-1. <a href="https://webbluetoothcg.github.io/web-bluetooth/#automated-testing">Web Bluetooth</a>
-
-1. <a href="https://www.w3.org/TR/digital-credentials/#automated-testing">Digital Credentials API</a>
-
-1. <a href="https://www.w3.org/TR/permissions/#automation-webdriver-bidi">Permissions</a>
-
-1. <a href="https://wicg.github.io/nav-speculation/prefetch.html#automated-testing">nav-speculation</a>
-
-1. <a href="https://wicg.github.io/ua-client-hints/#automation">User-Agent Client Hints</a>
-
-
 1. <a href="https://www.w3.org/TR/digital-credentials/#automated-testing">Digital Credentials API</a>
 
 1. <a href="https://www.w3.org/TR/permissions/#automation-webdriver-bidi">Permissions</a>