refactor(docs-infra): remove linenums=false since it is now the default (#31674)

PR Close #31674

aio/tools/transforms/templates/api/includes/class-overview.html

@@ -2,7 +2,7 @@
 {% import "lib/descendants.html" as descendants -%}
 
 <section class="{$ doc.docType $}-overview">
-<code-example language="ts" hideCopy="true" linenums="false">
+<code-example language="ts" hideCopy="true">
 {% if doc.isAbstract %}abstract {% endif%}class {$ doc.name $}{$ doc.typeParams | escape $}{$ memberHelper.renderHeritage(doc) $} {{$ memberHelper.renderMembers(doc) $}
 }
 </code-example>

aio/tools/transforms/templates/api/includes/ngmodule.html

@@ -3,7 +3,7 @@
 {% for ngModule in doc.ngModules %}
   <li>
     <a href="{$ ngModule.path $}">
-      <code-example language="ts" hideCopy="true" linenums="false" class="no-box">{$ ngModule.name | escape $}</code-example>
+      <code-example language="ts" hideCopy="true" class="no-box">{$ ngModule.name | escape $}</code-example>
     </a>
   </li>
   {% endfor %}