[release-notes] fix mallard markup mistakes

[Link Dupont <link src gnome org>]

commit aa89adbfa46459aacc973e0756d0d015f37ca4e8
Author: Link Dupont <link sub-pop net>
Date:   Tue Aug 31 14:03:23 2021 -0400

    fix mallard markup mistakes

 help/C/developers.page | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/help/C/developers.page b/help/C/developers.page
index bec6d90d..0d307d81 100644
--- a/help/C/developers.page
+++ b/help/C/developers.page
@@ -249,7 +249,7 @@
       support in WebKit.</p></item>
       <item><p>The base runtime was updated to <code>freedesktop-sdk
       21.08</code>, bringing in newer toolchains (such as GCC 11 and LLVM 12)
-      and libraries (such as Mesa 21.2).</p</item>
+      and libraries (such as Mesa 21.2).</p></item>
     </list>
   </section>
 
@@ -281,6 +281,7 @@
       XWayland support.</p></item>
       <item><p>Added <app>xdg-desktop-portal-gnome</app> for GNOME-specific
       desktop portals.</p></item>
+    </list>
   </section>
 
   <section id="thats-not-all">