[release-notes/gnome-3-36] Add section on flatpak

[Link Dupont <link src gnome org>]

commit 77ee35a866b98e4739c5a94c8ff7302b15802c9a
Author: Link Dupont <link sub-pop net>
Date:   Sun Mar 1 21:23:22 2020 -0500

    Add section on flatpak

 help/C/developers.page | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)
---
diff --git a/help/C/developers.page b/help/C/developers.page
index 2014c11e..f347e790 100644
--- a/help/C/developers.page
+++ b/help/C/developers.page
@@ -29,7 +29,17 @@
   <section id="flatpak">
     <title>Flatpak</title>
     <media its:translate="no" type="image" src="figures/flatpak.png"/>
-    <p></p>
+    <p><link href="https://flatpak.org/";>Flatpak</link> is a cross-distribution,
+    cross-desktop technology for application building and distribution. While it
+    is separate from the GNOME project, Flatpak is central to GNOME’s developer
+    experience plans.</p>
+    <p>During this release cycle, the Flatpak team released a new stable series:
+    1.6.x. This introduces an update monitoring API available via the Flatpak
+    Portal D-Bus interface. An application can use this API to monitor for
+    updates, prompting the user to install the update and restart the application.
+    Along side the D-Bus API, a library called <code><link
+    href="https://github.com/flatpak/libportal";>libportal</link></code> offers
+    asynchronous wrappers for most Flatpak portals, with a familiar GObject API.</p>
   </section>
 
   <section id="">
@@ -41,8 +51,8 @@
     <title>Other Improvements</title>
     <p>Other improvements in GNOME &gnomeversion; include:</p>
     <list>
-      <item><p>GMemoryMonitory can be used to help an application lower memory
-      usage when needed.</p></item>
+      <item><p><code>GMemoryMonitory</code> can be used to help an application
+      lower memory usage when needed.</p></item>
     </list>
   </section>