Editorial: Cite API design principles for default true advisement

index.bs

@@ -2282,6 +2282,7 @@ corresponding argument omitted.
     of <emu-val>true</emu-val> for {{boolean}}-typed arguments,
     as this can be confusing for authors who might otherwise expect the default
     conversion of <emu-val>undefined</emu-val> to be used (i.e., <emu-val>false</emu-val>).
+    [[API-DESIGN-PRINCIPLES]]
 </p>
 
 If the type of an argument is a [=dictionary type=] or a [=union type=] that has
@@ -4820,7 +4821,7 @@ members' entries might or might not [=map/exist=] in the dictionary value.
     encouraged not to use <emu-val>true</emu-val> as the [=dictionary member/default value=] for
     {{boolean}}-typed [=dictionary members=], as this can be confusing for authors who might
     otherwise expect the default conversion of <emu-val>undefined</emu-val> to be used (i.e.,
-    <emu-val>false</emu-val>).
+    <emu-val>false</emu-val>). [[API-DESIGN-PRINCIPLES]]
 </p>
 
 An [=ordered map=] with string [=map/keys=] can be implicitly treated as a dictionary value of a