postgraphile website: Fix v5 page (#2693)

Author: benjie

postgraphile/website/src/pages/v5beta.mdx

@@ -107,6 +107,8 @@ Everyone else can see some detail in the PostGraphile [changelog](https://github
 
 </div>
 
+{
+
 <table className={v5betaStyles.releasesTable}>
 
 <thead>
@@ -194,6 +196,8 @@ Everyone else can see some detail in the PostGraphile [changelog](https://github
 
 </table>
 
+}
+
 <SecondarySection
   title={`Development Support`}
   tagline={`Priority text support straight from the maintainer`}