[gtkmm-documentation/wip/dboles/no-new: 1/2] docb: Don't use `new` to make button for no reason

[Daniel Boles <dboles src gnome org>]

commit 909ba4477e9a236a8fdf76f3cf45b95295da18f3
Author: Daniel Boles <dboles src gmail com>
Date:   Sun Nov 24 19:30:43 2019 +0000

    docb: Don't use `new` to make button for no reason

 docs/tutorial/C/index-in.docbook | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/tutorial/C/index-in.docbook b/docs/tutorial/C/index-in.docbook
index e06bae1..1fc1093 100644
--- a/docs/tutorial/C/index-in.docbook
+++ b/docs/tutorial/C/index-in.docbook
@@ -887,7 +887,7 @@ or set it later with <methodname>set_label()</methodname>.
 
 <para>To define an accelerator key for keyboard navigation, place an underscore before one of the label's 
characters and specify <literal>true</literal> for the optional <literal>mnemonic</literal> parameter. For 
instance:
 </para>
-<programlisting>Gtk::Button* pButton = new Gtk::Button("_Something", true);</programlisting>
+<programlisting>auto pButton = Gtk::make_managed&lt;Gtk::Button&gt;("_Something", true);</programlisting>
 
 <para>
 <classname>Gtk::Button</classname> is also