[gnome-builder] Fix typos in panels.rst

[Christian Hergert <chergert src gnome org>]

commit f3c8f39f3fe740eb07fa21f1c817320fd034ada0
Author: Dan Čermák <dcermak suse com>
Date:   Fri Sep 6 12:28:25 2019 +0200

    Fix typos in panels.rst

 doc/help/plugins/workbench/panels.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/doc/help/plugins/workbench/panels.rst b/doc/help/plugins/workbench/panels.rst
index 8054a42db..0b993a8e2 100644
--- a/doc/help/plugins/workbench/panels.rst
+++ b/doc/help/plugins/workbench/panels.rst
@@ -39,8 +39,8 @@ You'll be provided access to the editor surface with the ``editor`` variable.
 
            # To add a utility section
            self.bottom = Dazzle.DockWidget(title='My Bottom Panel', icon_name='gtk-missing', visible=True)
-           self.bottom.add(Gtk.Label(lable='Hello, Bottom Panel', visible=True))
-           editor.get_utilties().add(self.bottom)
+           self.bottom.add(Gtk.Label(label='Hello, Bottom Panel', visible=True))
+           editor.get_utilities().add(self.bottom)
 
        def do_unload(self, editor: Ide.EditorSurface):