[glibmm/glibmm-2-66] Doxyfile.in: Remove obsolete entry

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 0ad59fa58f4e86ecec7fd90b83342f1d9fde1653
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Mon Sep 19 10:37:30 2022 +0200

    Doxyfile.in: Remove obsolete entry

 docs/reference/Doxyfile.in | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index f2d3fc97..bca64343 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -158,7 +158,6 @@ CLANG_OPTIONS          =
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
 ALPHABETICAL_INDEX     = YES
-COLS_IN_ALPHA_INDEX    = 5
 IGNORE_PREFIX          =
 #---------------------------------------------------------------------------
 # Configuration options related to the HTML output