[krb5-auth-dialog] help: Make string match the text in prefs

[Guido Günther <guidog src gnome org>]

commit 7de2b8d562246f83509a327f5b7f8f84ba9ae35d
Author: Guido Günther <agx sigxcpu org>
Date:   Sun Feb 14 16:36:14 2021 +0100

    help: Make string match the text in prefs
    
    Closes: #8

 help/C/index.docbook | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/index.docbook b/help/C/index.docbook
index 82864b8..95b81e6 100644
--- a/help/C/index.docbook
+++ b/help/C/index.docbook
@@ -301,7 +301,7 @@
           <row>
             <entry colsep="0" rowsep="0" valign="top">
               <para>
-                <guilabel>Warn .. minutes before expiry</guilabel>
+                <guilabel>Warn .. minutes before ticket expiry</guilabel>
               </para>
             </entry>
             <entry colsep="0" rowsep="0" valign="top">