Editorial: insert '!' and '?'

In PR $1571:

https://github.com/tc39/ecma262/pull/1571/files#diff-3540caefa502006d8a33cb1385720803L19940
removed the step
"Assert: _constructorInfo_ is not an abrupt completion."
but didn't insert the equivalent "!" on the previous line.

https://github.com/tc39/ecma262/pull/1571/files#diff-3540caefa502006d8a33cb1385720803L23362
removed a ReturnIfAbrupt step,
but didn't insert the equivalent '?' in the previous line.

spec.html

@@ -19961,7 +19961,7 @@ <h1>Runtime Semantics: ClassDefinitionEvaluation</h1>
               <pre><code class="javascript">constructor() {}</code></pre>
               using the syntactic grammar with the goal symbol |MethodDefinition[~Yield, ~Await]|.
         1. Set the running execution context's LexicalEnvironment to _classScope_.
-        1. Let _constructorInfo_ be DefineMethod of _constructor_ with arguments _proto_ and _constructorParent_.
+        1. Let _constructorInfo_ be ! DefineMethod of _constructor_ with arguments _proto_ and _constructorParent_.
         1. Let _F_ be _constructorInfo_.[[Closure]].
         1. If |ClassHeritage_opt| is present, set _F_.[[ConstructorKind]] to `"derived"`.
         1. Perform MakeConstructor(_F_, *false*, _proto_).
@@ -23379,7 +23379,7 @@ <h1>Runtime Semantics: Evaluation</h1>
         </emu-alg>
         <emu-grammar>ExportDeclaration : `export` `default` ClassDeclaration</emu-grammar>
         <emu-alg>
-          1. Let _value_ be BindingClassDeclarationEvaluation of |ClassDeclaration|.
+          1. Let _value_ be ? BindingClassDeclarationEvaluation of |ClassDeclaration|.
           1. Let _className_ be the sole element of BoundNames of |ClassDeclaration|.
           1. If _className_ is `"*default*"`, then
             1. Let _env_ be the running execution context's LexicalEnvironment.