[release-notes] Add section on Maps

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 544fd064e818f0b5ba5969b98064ea5875f8f789
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Sep 3 16:25:07 2020 -0500

    Add section on Maps

 help/C/figures/maps.png | Bin 0 -> 996385 bytes
 help/C/index.page       |  10 ++++++++++
 2 files changed, 10 insertions(+)
---
diff --git a/help/C/figures/maps.png b/help/C/figures/maps.png
new file mode 100644
index 00000000..c2dcc9c2
Binary files /dev/null and b/help/C/figures/maps.png differ
diff --git a/help/C/index.page b/help/C/index.page
index 2fdda45c..6b02ced4 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -89,6 +89,16 @@
     you visit.</p>
   </section>
 
+  <section id="maps">
+    <title>Adaptive Maps</title>
+    <p>Maps is now adaptive for mobile use. When the window is narrow, the
+    routing sidebar will now be shown in a separate view, with a back button
+    to return to the map view. In addition, it is now possible to display
+    labels in satellite view, and to switch Maps to night mode to emphasize the
+    visual content of the maps.</p>
+    <media type="image" width="940" src="figures/maps.png"/>
+  </section>
+
   <section>
     <title>Utilities</title>
     <p>Several utilities have been redesigned to provide a more polished and