Add editors markup to 'extensible web' notes

spec.html

@@ -280,7 +280,7 @@ <h1>Realm.prototype.evaluate ( _sourceText_ )</h1>
 				1. Return ? PerformRealmEval(_sourceText_, _callerRealm_, _evalRealm_).
 			</emu-alg>
 
-			<emu-note>
+			<emu-note type=editor>
 				Extensible web: This is the dynamic equivalent of a &lt;script&gt; in HTML.
 			</emu-note>
 		</emu-clause>
@@ -299,7 +299,7 @@ <h1>Realm.prototype.importValue ( _specifier_, _exportName_ )</h1>
 				1. Return ? RealmImportValue(_specifierString_, _exportNameString_, _callerRealm_, _evalRealm_, _evalContext_).
 			</emu-alg>
 
-			<emu-note>
+			<emu-note type=editor>
 				Extensible web: This is equivalent to dynamic import without having to evaluate a script source, which might not be available (e.g.: when CSP is blocking source evaluation).
 			</emu-note>
 		</emu-clause>