[evolution] help: Add note about UI element sorting workaround

[Andre Klapper <aklapper src gnome org>]

commit 162c4cf52ad0d7e44f224c9a09f9be5b665f6749
Author: GN <gnome_2020 nuclearsunshine com>
Date:   Mon Jan 3 19:42:18 2022 +0000

    help: Add note about UI element sorting workaround
    
    Fixes #1755

 help/C/customize-ui-items.page | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/help/C/customize-ui-items.page b/help/C/customize-ui-items.page
index e643e439ae..d18c2dcb89 100644
--- a/help/C/customize-ui-items.page
+++ b/help/C/customize-ui-items.page
@@ -31,6 +31,8 @@
 <p>Copy those files with the file ending <file>.ui</file> which you would like to modify to your personal 
configuration folder <file>$HOME/.config/evolution/ui/</file>.
 Modify the files in your personal configuration folder so the next <app>Evolution</app> software update will 
not overwrite your changes.</p>
 
+<p>Changing the order of tool bar/menu items in some <file>.ui</file> files may not affect their displayed 
order in <app>Evolution</app>. As a workaround, the attribute <code>position='top'</code> can be added to 
some elements (e.g. <code>toolitem</code> and non-empty <code>placeholder</code> elements), which will place 
them before other items in the group and cause them to be displayed according to their order in the 
<file>.ui</file> file. This attribute may need to be added to all items in a group to achieve the overall 
desired item order.</p>
+
 <p>The modified files will be used if the <code>evolution-ui-version</code> attribute of the root 
<code>ui</code> element matches the version of the default files provided by <app>Evolution</app>.</p>
 
 <p>To change keyboard shortcuts, edit <file>~/.config/evolution/accels</file> while <app>Evolution</app> is 
not running. Commented lines start with a <code>;</code> character and will be ignored. Not all shortcuts can 
be changed though.</p>