IDL: Add missing spec links

The only IDL interface without a spec link is Internals

Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.idl

@@ -1,5 +1,6 @@
 #import <DOM/Event.idl>
 
+// https://registry.khronos.org/webgl/specs/latest/1.0/#5.15
 [Exposed=(Window,Worker)]
 interface WebGLContextEvent : Event {
     constructor(DOMString type, optional WebGLContextEventInit eventInit = {});

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.idl

@@ -1,5 +1,6 @@
 #import <WebGL/WebGLRenderingContextBase.idl>
 
+// https://registry.khronos.org/webgl/specs/latest/1.0/#5.14
 [Exposed=(Window,Worker)]
 interface WebGLRenderingContext {
 };

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.idl

@@ -13,6 +13,7 @@ dictionary WebGLContextAttributes {
     boolean desynchronized = false;
 };
 
+// https://registry.khronos.org/webgl/specs/latest/1.0/#5.14
 interface mixin WebGLRenderingContextBase {
     // NOTE: Functions that have the [WebGLHandlesContextLoss] extended attribute in the spec do not have them here.
     //       This is because context loss is handled manually on a function by function basis instead of having to add it to the