Remove the extra = character from the attribute's default value prop

scripts/lib/api/generateApiComponents.ts

@@ -230,7 +230,7 @@ function prepareAttributeProps(
   const attributeTypeHint = text
     .slice(Math.min(colonIndex + 1, equalIndex), equalIndex)
     .trim();
-  const attributeValue = text.slice(equalIndex, text.length).trim();
+  const attributeValue = text.slice(equalIndex + 1, text.length).trim();
 
   $(`<h3>${name}</h3>`).insertBefore($dl);