[mutter] gschema: Add missing summaries for toggle-tiled-left/toggle-tiled-right

[Marge Bot <marge-bot src gnome org>]

commit b2126fec92e82b82bb9348c7ca125119a7a109f0
Author: Ian Douglas Scott <idscott system76 com>
Date:   Wed Nov 18 13:48:08 2020 -0800

    gschema: Add missing summaries for toggle-tiled-left/toggle-tiled-right
    
    Wording copied from `data/50-mutter-windows.xml`.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1573>

 data/org.gnome.mutter.gschema.xml.in | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/data/org.gnome.mutter.gschema.xml.in b/data/org.gnome.mutter.gschema.xml.in
index c4324db485..20b7e4276e 100644
--- a/data/org.gnome.mutter.gschema.xml.in
+++ b/data/org.gnome.mutter.gschema.xml.in
@@ -161,10 +161,12 @@
 
     <key name="toggle-tiled-left" type="as">
       <default><![CDATA[['<Super>Left']]]></default>
+      <summary>View split on left</summary>
     </key>
 
     <key name="toggle-tiled-right" type="as">
       <default><![CDATA[['<Super>Right']]]></default>
+      <summary>View split on right</summary>
     </key>
 
     <key name="tab-popup-select" type="as">