[release-notes/gnome-3-34] Add section on sysprof

[Link Dupont <link src gnome org>]

commit c354b780ddd314498024aedfcc0b68d69140f906
Author: Link Dupont <link sub-pop net>
Date:   Mon Aug 26 10:57:41 2019 -0400

    Add section on sysprof

 help/C/developers.page | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/help/C/developers.page b/help/C/developers.page
index efb09113..28a3e3a9 100644
--- a/help/C/developers.page
+++ b/help/C/developers.page
@@ -58,6 +58,17 @@
     operations like pushing, staging and committing.</p>
   </section>
 
+  <section id="sysprof">
+    <title>Sysprof</title>
+    <p><app>Sysprof</app>, the GNOME instrumenting and system profiling utility,
+    saw significant development this release. In order to streamline and simplify
+    the performance profiling process for developers, <app>Sysprof</app> has been
+    integrated with a number of core platform libraries, including GJS, GTK, and
+    Mutter.</p>
+    <p>More data sources have been added too, including an energy usage monitor.
+    Finally, the UI was redesigned to improve the profiling workflow.</p>
+  </section>
+
   <section id="pango">
     <title>Pango</title>
     <p>The <em>Pango</em> font rendering library introduced a few new features