[zenity] Added icon-name property to man page

[Logan Rathbone <larathbone src gnome org>]

commit 6eff92070bc7eaf5c732d371e260b765d7293c6c
Author: Andrew Yoder <ayoder770 gmail com>
Date:   Sun Mar 21 12:15:46 2021 -0400

    Added icon-name property to man page
    
    Signed-off-by: Logan Rathbone <poprocks gmail com>

 data/zenity.1 | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/data/zenity.1 b/data/zenity.1
index 06a1aba6..8b957fa5 100644
--- a/data/zenity.1
+++ b/data/zenity.1
@@ -79,6 +79,9 @@ Set the dialog title
 .B \-\-window-icon=ICONPATH
 Set the window icon with the path to an image. Alternatively, one of the four stock icons can be used: 
'error', 'info', 'question' or 'warning'
 .TP
+.B \-\-icon-name=ICONNAME
+The name of the icon to display on the dialog to override the default stock icons
+.TP
 .B \-\-width=WIDTH
 Set the dialog width
 .TP